The volatility of bitcoin won't end anytime, I think we have to give more time for more people to appreciate bitcoin and use it in daily business transactions. At the moment, I believe some form of regulation can help make things pretty much more stable than we have at the moment otherwise we shall experience more issues with volatility. The high price volatility of Bitcoin and other decentralized cryptocurrencies will never evaporate. On the perverse, if the expense of cryptocurrency will improve, the volatility will only boost, as the expense spectrum will develop.
As long as the price of cryptocurrency will depend on supply and demand, the high price volatility of cryptocurrency will remain. Still think the ETF funds can solve this problem, or at least will lessen the volatility of Bitcoin. The more control of the market, the less volatility it will be, now we still don't have any rule or laws to govern this market,.
Time and wider usage are the things that are most likely to bring stability to the price of Bitcoin. The more people who are using it for regular transactions, the more of it that is likely to keep flowing around in the network. This keeps the people running nodes happy, so fees stay stable and could potentially reduce. However it is a sort of hybrid commodity at the moment because it acts in some ways like gold, where people just want to buy and hold it for long periods, whereas it might be better for volatility if more of the currency kept flowing around in a functional capacity. Time will also assist because more people become more comfortable that it's a safe asset over the long run.