Bitcoin will never become a stable currency. If Bitcoin becomes a stable currency then the popularity of Bitcoin will gradually decrease. People find this coin most suitable for trading and investing due to the volatility of Bitcoin market prices. I have invested in Bitcoin in anticipation that Bitcoin will become more popular in the future and the market will remain high. But if Bitcoin becomes a stable currency I will never hold Bitcoin as an investment. So everyone will be in the same situation as me if Bitcoin becomes a stable currency. So none of you imagine that Bitcoin will become a stable currency.
Bitcoin may become significantly less volatile in the future when its price rises well. This does not mean that its price will no longer rise, it will continue to rise, but this will happen without big fluctuations, there will not be a strong increase and a strong fall.
If, at the same time, bitcoin is not interesting for investors for speculation, then it may become interesting as a means of payment, and I will be very happy about this. But I think that many investors will still buy bitcoin because it will be a stable asset that will grow and save money from inflation.