Sure.

25% of BTC... this is fairly easy to establish.  Circulation 5.778M 21M = 27.5%, a more accurate number.

"Mature community" is just a guess.  Take your own guess.  When Bitcoin is a mature currency, seen by the world as being like gold or some other asset - how big will the Bitcoin community be?  Ten million?  A hundred million?

There's 5,264 people registered on the forums, and perhaps several times that who use Bitcoin but who do not use the forum.  I used the number 0.1% as a guess, it could just as easily be 0.01% or 1%.  This number represents the proportion of the people here NOW versus the people who will use Bitcoin at some point in the future.

Whatever the number is, it's far less than 27.5% of the population of the industrialized world, and far smaller than how big the community will have to be for BTC quotes to appear, say, in the Wall Street Journal or on CNNMoney.com next to quotes for gold and oil and pork bellies.

One of the appeals of Bitcoin is protection from inflation at the hands of the Bernanke types who can print money on a whim.  An abuse, you could say, to the tune of 5% to 10% per year, even though they claim it's less.

The ratio of 25% to 0.1% (big circulation, little community) just happens to enable a different kind of abuse.  One where holders of BTC are able to wipe out the value of your holdings anywhere from 5-95% in an instant, you just never know when that will be.  Penny stock pump-n-dumpers are familiar with it.  Sure, Bitcoin has inherent value that makes it far more useful than a penny stock, but it's highly volatile and easily manipulated because of that ratio.

Case in point, I can personally afford (in BTC) to wipe out all the visible outstanding buy orders on MtGox.  And I'm one guy, holding a fraction of 1% of the BTC circulation.  How many people use BTC now, hundreds, thousands?  As one guy, I can make your and everyone else's BTC worth at least 25% less on a whim in minutes.  How's that for fair?

I agree, and take it one step further: the market can be manipulated with far fewer amounts than $millions!

With $6000 in BTC, I can make this 5 million USD economy into a 3 million USD economy.  Doesn't something seem wrong with that?

Right, this is perfectly understandable, it sounds like you feel we deserve to be enriched at others' expense because of all the risk we took.  (Which was what, exactly, by the way?)

Bernanke probably feels the same way...  After all, printing money is tiring and risky and at the end of the day, he and all his buddies deserve to be compensated for that lavishly with the fruits of others' labor.

The thing about Bitcoin is that "jonny come late" has free access to the kitchen.  If "jonny come late" doesn't like that only 1% of the pie is on the table but that he must pay for the whole pie, he might just start some cookin.

Were the late immigrants to America unnerved by the fact that they would be increasing the value of the US dollar? And that they had no US dollars to begin with?

This sort of volatility will be unavoidable in the early days of our currency. It's a downside to having an entirely free market, an entirely free non-inflationary currency. I can see where you're coming from: an inflationary currency would help counter the problem of too much necessarily being in the hands of one or a few. It would require a person do more than sit on the currency they got in the beginning until their sitting on it helps drive the price up, at which point they could release all their currency and drive the price back down. Rinse and repeat. But eventually the malicious will run out of funds. The market will settle. It's a rough road, potentially, but it's the one we've chosen. If the majority of the early adopters have the best interests of our economy at heart, they'll bleed their wealth slowly and avoid dumping it all at once.

There may well be a market for an inflationary currency. Start up a branch, if you like. Nobody is stopping you.

Indeed, the problem in my opinion is that Bitcoin is advertised and defended by the ones that have the biggest financial interest of it being popular. When (if) it becomes popular, newcomers might find this unfair and fork the blockchain and have competing bitcoins. I expect that newcomers may fork client and/or blockchain locally, maybe at a national level, or even more local levels, or maybe based on some other grouping criterion like being part of a certain community (especially if I'm not all that interested in dealing with the entire world).

This might be amplified by following facts :
- Bitcoin is spreading from the richer countries to the less rich countries and then the poorer countries (because of it being computer based). This might be perceived as very unfair, while I think this feeling is starting to grow more and more worldwide.
- People may dream that their forked blockchain is taken as reference later by a group of people, potentially making them very rich. Moreover, it must be thrilling to be generating 50 btc every minute. You can get a group of people to work on a forked blockchain during 3 days, hoard thousands of btc just in case they manage to join more people to their own blockchain. Otherwise you can just lose these 3 days mining, for it would be worth only a few btc on the normal block chain.

my bad, but you got the idea. 

I think a lot of normal, non greedy people are interested in alternative economic systems, because they realize the actual ones enslaves the number for the few. A number of alternatives concepts exist such as the concept of Local Exchange Trading Systems (LETS). https://secure.wikimedia.org/wikipedia/en/wiki/Local_Exchange_Trading_Systems

I think this interest in alternative systems will grow rapidly, with the growth of the alter-globalization movement. In a certain way, the concept of Bitcoin could attract those people, but with the actual client/blockchain, Bitcoin just replaces an 'unfair system' with another rather unfair system.

So do it. I don't think you'd be successful as I (and others) would probably buy up some of your BTC and not give them back. I've noticed that there are far fewer large blocks forsale than there used to be. If you take out all the buy orders there are still only a few sell orders on the market, all above your sell price. You can't buy those at a profit, so you're going to have to wait for other sellers to come onto the market. Would there be any? Probably not enough to get your coins back.