Tell me why exactly investors will rush to buy in to an under performing asset just because it's packaged into an ETF? Everyone and their hairdresser is now aware of bitcoin... if they had wanted to invest in it, they would have invested in it. Clearly, the last 9 months are telling us something: they're not.
Some investors cannot invest in Bitcoin because of regulatory concerns. The EFT enables huge amounts of money to be invested with no friction
Also: some investors won't invest in Bitcoin because their financial advisors don't recommend it, and their financial advisors don't recommend it because they can't get a commission out of selling it.
In my experience "financial advisers" at the retail or lower private wealth management levels have exactly zero useful advise to share, and simply parrot the exact same useless advise you can pick up in your average issue of Forbes or Money Magazine. (i.e. always use index funds, use stock/bond ratios based on age, etc)
The real investors (VCs, PE funds, etc.) are starting to move more and more into bitcoin. These are the people to watch. Just look at the silk road coins, 100% picked up by the same VC to bootstrap a new service. Investment by these investors is accelerating, and there are deep pockets there.