I don' think bitcoin cash overtake bitcoin because BCH is a shit coin. After Emil Oldenburg and Charlie Lee sold all bitcoin that was holding by reasons of bitcoin recently as: low speed transaction, high fees... even Emil Oldenburg said that he will use BCH instead of bitcoin, this did the price of BCH are increasing very high but i dont bch can instead of bitcoin. The coin which can instead of bitcoin only is Ethereum that have technology is better than bitcoin, not BCH