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?
That's the trader's mind. Honestly, we have still the other way to trade behind using bitcoin for the general trade. I will still use it because there are a lot of the sources to trade. I will never leave it.
A lot of the bitcoin's advantage have helped me a lot.
Also because since we are holding our bitcoin for a very long time and waiting until its price goes up to something that it never hit before, that is why we are hoping that bitcoins price would fluctuate always in a good price, why? because of only one thing, to have PROFIT from it, not just profit, a huge PROFIT, for our patience to earn.
But still, even though its price would just be stable for years in $900, I would still use it, $900 per bitcoin is not that bad compare to its price before, it is better to have something than to have nothing at all.
I think there is more to bitcoin than just the possibility of a dramatic price increase.
Anonymity is a big factor for many people. Or the possibility to send money without having a bank account.
So for me there would still be reason to use bitcoin even if it is stable.
Besides, a stable currency is better than one that loses in value.