Who cares, we would be billionaires!!!

And more decimal places can be added...

That will be a great problem to have...that would mean that 1 bitcoin would be worth 1 million dollars. I think we are a long way off from those numbers. But Im sure if it becomes an issue well have a solution.

It really is just a question of moving decimal points a few spots as needed. AS long as everyone is getting value for their btc or hashing power things should be fine. 

Thread would be made 900% more accurate to near-future reality by replacing "if" with "when" in every instance.

If bitcoin value increases a lot, more decimal place can be introduced.  Transaction fee can be changed as well.

As long as you can specify your own transaction fee, the problem will take care of itself naturally.  i.e. I will keep my transaction fees in line with what they are currently... a few pennies per transaction.

not much would happen imho..business as usual.

In today's economy , there are around 5 trillion dollars , if you consider all economies.

Let's say 15 million BTC are mined , that will mean that even if the entire economy is only Bitcoin , each Bitcoin will be worth 5,000,000,000,000/15,000,000 = 333,333$ in today's money.

Bitcoin will never be worth a million $ of today's money. Sure , it may happen one day when USD has inflated so much that it is worth a cent of today's money. But in comparison to the money of now , Bitcoin can not cross a million.

Okay , take it as 6.3 trillion , assuming there are all 21m BTC mined.
That will still be 300k , which is much lesser than necessary to cause a problem resulting in need to further divide Bitcoin.

It is unlikely that Bitcoin will ever cross a million $ , but I expect it to definitely hit the 10k range.
People who expect it to reach 1m in a few years are extreme fanatics.

Comparing Bitcoins future growth to the 300x boost it saw ages ago is stupid.
If Satoshi told 2 people about BTC when he first envisioned it and tripled the Bitcoin enthusiasts in a minute , we should not expect that to happen again in a minute.

TLDR; Bitcoin will rise , but even if it becomes as big as USD is now , it will be under 40k$ per Bitcoin (of todays USD value)
We will not need to further divide BTC in a long long time and if we do , we will have far more capable devs waiting to do so.

Just to throw this out there...

Fed M2 is >$11t right now and has been increasing at an insane rate in the past few years, ~9% annually. Assuming 11m spendable coins now, we get to - wait for it - $1m/btc on the nose if BTC matches USD (without factoring in displacement)! -- but what's interesting is that we're right around a 9% annual rate of inflation with BTC right now -- basically, any increase in nominal $price right now has to come from an increase in "real" investment money, but this will be changing. Before the next halving, the rate will dip well below the M2 inflation rate. Assuming M2 maintains its current course, BTC should be increasing 4-6% annually from USD inflation after the next halving, then ~7%/yr in the next halving. That's without factoring any kind of real growth in.

Anyway -- just looking at the effects of compounding inflation 10 years down the line, 11t @ 9% growth annually gets us to $26t M2. We'll have around 16-17M spendable coins at that point (I'll say 16.5M), I think, so we get ~$1.58M/BTC if it meets USD usage (and assuming that usage results in the same price effect).

What really underlines Bitcoin's awesomeness as a savings vehicle comes after that point, though, because inflation will be pretty much gone from BTC at that point. Assuming the USG keeps pumping M2 @ 9% for ANOTHER 10 years after, we get to ~$62t M2. Bitcoin, however, will only inflate to having maybe 18M spendable coins (and at this point, coin losses may actually match target inflation rate). 20 years down the road, then, the number we're referencing becomes ~$3.44M/BTC.

That brings us to 2034, yeah? (yeah.) Anyway, we have another 66 years in this century, so let's just figure the numbers out for the end product. 66 years of M2 inflation @ 9% gets us to 18.2Q (quadrillion, in case that's your first time seeing it! ). Assuming 19M spendable coins (after this point and probably somewhere in this range of time, BTC is deflating due to "coin loss leakage"), we get to ~$958M/BTC. I think, by the end of this century, either BTC goes over $1b/coin or it dies.