Because majority of the forumers here think wall street managers are idiot and will buy bitcoin and hence bring the price to the moon.
Weellll, yes, but there's also the fact that I can't buy Bitcoin with my 401k account, and most fools and their money have heard that penny stocks are bad by now. But Bitcoin! Hey Phil, this is your broker, wanna buy some Bitcoin? Have you heard of this??? It's the latest thing, here are the numbers, you can Google them if you don't believe me!
ETF is just another notch in the bedpost, and it will bring in some demand. How much is anyone's guess.