We really need ETF. Did you know what happened to gold when ETF was approved? It dramatically rose up high and became stable. Imagine what will happen to cryptocurrency once this thing happen. Cryptocurrency prices will increase also and this will make our market go bullish.
In 2017 crypto was bull market without any news about Bitcoin ETF approved, so we not really need it to trigger bull market because this bullish trend can be come with anothers news. There are alot of others mass adoption of crypto so not only depend on the Bitcoin ETF crypto will raise.
Are you sure we don't need ETF? What happened when ETF was disapproved more than one time? There was a decline of price in bitcoin. See, it depends on ETF.