The bitcoin will never be popular as now when theprice is stable you knwo lots of people will invest withthee bitcoin because of his value and price
so they wont invest with it when that stops.
In the first place bitcoin is not an investment, it was design as a digital currency where we can use to transact online, the stable price of bitcoin is brought about by the popularity and people are adopting that would make the price stable as whales can no longer manipulate the price.
it doesn't really matter what the first purpose of bitcoin was. all that matters is what is happening right now, and how are people using bitcoin. at this point bitcoin is being used as an investment tool by the majority of the people. if the price was stable, then certain investors will leave again, but in their place there will be new investors or wealthy people looking to use bitcoin as store of value.