i think if more people know about bitcoin then bitcoin can be popular and its not about bitcoin had a stable price, its about more people that will want to know and use bitcoin itself that will make bitcoin more popular
yeah I think there are other advantages of bitcoin besides having fluctuations that could make you rich. bitcoin certainly has advantages other than that and I think bitcoin could become popular as a great payment method, etc.
Since that is its main purpose then definitely it is already popular when time comes that we will be able to see a stable price, right now the price is not yet stable since users are not that many but we have to determine this time as an opportunity to invest or increase our investment.