1. What should we expect from cryptocurrencies on the scale of years or even decades? 2. How many will be there and how many do we actually need?
1. If ICOs won't be regulated within this year or next coming years then we will have a sea of trash icos that doesn't have real usage and all are thinking an exit scam and soon icos will be dead.
2. There will be no exact number as long as the coins are essential and sustainable in the community it will and should remain.
I think that's not even possible, we all know that we are manipulated by the government, the real issue here is about the regulation thing. If they regulated it then ICO's will have a future but there's a limitation they should register it on SEC so government will recognize that as securities.