Bitcoin ETF is already already here, the price of Bitcoin has already shown some positive move over the news. But I don't think that's enough for Bitcoin volatility to be controlled. Volatility is one thing that makes Bitcoin what it is today, you saying Bitcoin volatility should be stopped means you are trying to make Bitcoin a stable coin. Which can't be possible because even the said stable coins out their are not that stable, they still lose value. Bitcoin volatile can only end if it's ever possible for Bitcoin to be controlled which is not possible.