Bitcoin would be still popular even if it had a stable price. Due to stability in its price, more companies have started to accept bitcoin. Due to low transaction fees, Bitcoin would be still popular.
Yes,even it could have become more popular because many companies and people dont accept bitcoin because of its instability in price but if it becomes stable then more and more companies would start accpeting it,and surely bitcoin could became even more popular after that.
Lets look at gold, the price has jumped on the last years, but its value were stable and people did invest huge ammounts at it, if bitcoin were something less volatil we could be and see big companies working with bitcoin already.