I have been reading many BTC holders all over the internet eagerly wanting ETFs to be accepted, thinking Wall Street money will increase the price of BTC to ATH and beyond. The truth is that if ETFs without 100% collateral are accepted by the SEC, then we will see price supression for many many years. The only good ETF would be the one the Winklevoss brothers (with 100% collateral) are trying to get accepted by the SEC. The other 10 or so ETF are crap and would hurt BTC's price in the long term, because they will eventually (to put it simple) sell more ETF of BTC than BTC themselves, hence circumventing the 21 million limit BTC and eventually supressing the price. Its how Wall Street works. It happened with Gold and Silver after 2011.

Check the following article from a Wall Street veteran Caitin Long where she explains this with more details:

https://www.forbes.com/sites/caitlinlong/2018/08/21/two-things-that-dont-mix-well-bitcoin-rehypothecation-and-chain-forks/#3c693741e14a

People need to be aware of this and prepare for either case.