the fork coins are not capable of having long term potential because no matter what they do, in the end they will remain a fork coin, a coin that was copied and created out of an original cryptocurrency.
on top of that, BCH didn't do a complete copy of bitcoin. it only copied part of bitcoin and removed a lot of additional options from it which limited its potential even more.
the only reason why it stays around is because Bitmain is a multi million dollar company that is keeping it alive.