The guy interviewed in that video in the link is apparently an ETF expert, whatever that means. But he says he thinks Bitcoin ETF's should follow about 6 months after the futures market starts up, so by summer 2018. Said he thinks an ETF could get $10 billion after the first couple months. So we're talking about ETFs coming in and taking maybe half a million bitcoin off the table. That'd be HUGE!
With the new futures trading at LedgerX and the Chicago Mercantile Exchange, an ETF will indeed be just a question of time.
I could imagine an ETF getting approved end of 2018, beginning of 2019!
Then things will get really interesting!!!