If I were you OP, I would not expect much from ETFs since they won't impact the market that much because:
I'd like to say the same thing as well that don't expect too much with it but understand what really ETF's are. It will determine a small price pump but just like what others said that you have to know the details regarding it. Just like what's with bitcoin futures before, a lot of people doesn't have an idea about and is only thinking about the spikes. I also agree with those that said it will create a short term pump and later on we'll be back on where it used to be. Well, I don't know if SEC is playing with this they keep on delaying it.