as web game developer i'm not going to use anything else than bitcoin ever. I dont want to waste my time with banks or other money processors if i can handle money transfers by myself. And do it better, cheaper and faster.

It could replace paypal. That makes it interesting enough. Plus, it's minable, which is amazing.

I think QR codes are easy. 

Cash register has a QR code. I scan and pay. The hyperfast bitcoin network of the future verifies the payment.  That was easy. I didn't have to touch filthy disease-laden cash or remember any passwords.  I pressed a button, typed in the amount, and the cash register rings.  It's a germophobe's dream!

No.

Not because of bitcoin fiat is dead because the world is tired of greedy backstabbing control freaks.  Things are moving most people don't know about.  They few are not going to be allowed to control everyone much longer.

not in my lifetime..
but i am an old fart.

I don't think so, but it doesn't need to. Email didn't completely replace written/printed letters

Bitcoin could really make online as well as person 2 person transaction very easy and practical.

example: If you are with a friend and want to remit 213 dollars, this is impractical since your friend does not accept credit cards.

that amount of cash isn't prohibitive but nobody thinks it is smart to carry that much around, your friend ultimately wants this in their account and may tolerate paypal, but doesn't really want to, because it will take 3 days before it gets anywhere they can actually use, and the "abnormal transaction" might freeze their paypal account since they dont use it regularly.

You don't think people will give up on fiat? The problem is, when fiat enters hyperinflation, people don't have a choice.

We live in an interesting time where the worlds' major fiat currencies are being printed at an alarming rate. And by alarming, I mean - look at the freakin' graph. That the USD and JPY haven't seen hyperinflation yet is astounding. The current rate of printing means that either (1) they will stop printing and the economy will crash and fiat will die, or (2) they will continue printing up until a point that triggers a hyperinflation event, the economy will still crash, and fiat will be just as dead. It isn't a question of waiting for QE to work - QE doesn't work. It's a last-resort tactic that can only end badly.

What's being done right now and for the recent past is a Keynesian experiment. Don't assume fiat will continue to be stable just because it's been that way for most of your life. Tunnel vision etc.

That being said, bitcoin's future could be anyone's guess. There are numerous possibilities -
- A future world with a combination of local currencies, barter, real bills systems, precious metals, localized freeconomies, resource-based economies, and assorted cryptocoins.
Look through history and you will find examples of local currencies, precious metals, barter economies, and even on a smaller scale, tribal and village economies. Fiat was a nice experiment in state domination and its result was that Satoshi invented bitcoin to get us back on track

Oh yeah, and what Elwar said. In the end, what matters to me is that I can use Bitcoin for many of the things I wish to purchase, which I can.

If a magic man approached me today and told me "Yes BTC will prosper as long as whatever fiat you choose." I would dump every penny today.