I think most users are involved in Bitcoin not because they belief in the technology, but because they hope the price will go thru the roof. So let us say the price would be at $900 for the next 50 years.
Would you still use and buy Bitcoin or would you leave?
EDIT: Poll added!
I will still using this bitcoin even if the price will be stable for the next 50 years. I'm not using this bitcoin for trading only. I use it as my money keeper. I use it as my online wallet, i use it to buy some items online. And many more. But I think many people will not use it if that will happen, because many user of bitcoin use it in trading to trade it to fiat.