if they were no longer list any coins,this will not be a problem since etherdelta is not only the exchanger we have in the cryptoworld.We have many choices like idex,coinexchange,binance,nextexchange,kucoin,mercatox,etc.nothing to worry with this!
I am not sure that they would add every new coin like it was case with Ether delta. Anyway I think this is good thing, and it will split good from bad ICO's.