I haven’t commented on this whole situation around BTC prices and the first ETF approved in the US so far - so while some don’t like it, it’s not something we can stop - and time will tell how good or bad it will be for Bitcoin.
Everything has pros and cons and it can be used for good or evil purposes.
Bitcoin ETF can boil up the market and get people hyped. It will become something normal but in short term, it will be very hot. The Bitcoin market was hot in late of 2017 because of Bitcoin Futures, CME and CBOE. People think Bitcoin Futures will help Bitcoin to rise to hundreds of dollar for one Bitcoin. Only 2 years later, in 2018 and 2019, with more Bitcoin Futures, Bitcoin was in bear market.
I think if it is only Bitcoin ETFs, they can have same effects but the market now is different. More institutions, and the ecosystem now is bigger. Big financial institutes or corporations can think the market is becoming big enough for them to join.