Actually i don't think this would happen until there is some stability in the market. Cryptocurrencies market are pretty volatile and can fall upto 20% in a day no fund manager would go on to invest in such things as people would really kill them for this. Moreover most of the funds are made under the guidelines of SEC which tell how much weightage can each sector carry. So until there is a change in such guidelines fund manager really won't be coming in Cryptocurrencies.