I think there is the possibility that this could be the end of the road for cryptocurrencies in the USA, from a practical standpoint.
Why? It was already the case that Bitcoin exchanges had to implement Know Your Customer (KYC) for USA.. doesn't sound to me like this is saying anything new in that regard.
These new rulings will affect many merchants also.
I suspect it will take a few days before the realizations sinks in as to what has happened.