Bitcoin will be more popular if the price is stable. More will choose bitcoin as an investment. Because bitcoin is a digital currency that is very easy to use.
It is not going to become more popular if bitcoin has a very stable price. The main reason why bitcoin is increasing because for having the unstable price.
And if ever the price of bitcoin had a stable one, I don't think that it will become popular.
Because people will just going to stick with the usage of fiat money or by using credit cards and other banking services.
There's no point if bitcoin has stable price.