You should know that everything has it's own advantage and disadvantages as the case may applies,, seing what is really behind the factors that boost the bitcoin market price to go bull is to be considered here where I know quite alright that bitcoin ETF is not one, but here in this regard may partially act as a catalyst in helping have a short experience of price change due to the event of the breaking news and this may be to rise or fall of the market price just as we have experienced now.
ETF is not what is making bitcoin becoming a mainstream, Bitcoin has already been fighting it's way through before that comes in, may e we should focus on halving which will eventually have to deal with high volatility during this period.