You BCH is already good as dead as of now I cant say it doesn't have potential but it wont really be a good candidate to become of those coins that would replace bitcoin anytime soon. I would rather believe on ETH to be the next one than on BCH when comes to cases that bitcoin would die. Answering on the question of when bitcoin price falls then theres only two things we can do. Hold up and don't panic sell and buy more cheaper bitcoins if you do still have the money to put on because normally bitcoins price would recover no matter what.