bitcoin price has gone up based on years of adoption
this price fall is down to the possibility of that slowing or reversing. this fork crap, higher fees and more money to be made elsewhere are all convincing reasons for less people to be keen on the idea. that's the basis for a real fall.
I agree, years of adoption have to be for a genuine purpose. If Bitcoin is practically not as useful as it was before, the price is going to fall.