"overtake" has a broad meaning in my opinion.
as far as usage and adoption as a real currency goes i can not see bitcoin cash doing anything. no business has backed them, there were always a small group of miners who forked it and then when it became profitable other miners jumped in and they will leave just as fast as soon as it becomes less profitable!
speaking of price, in lower levels it is all manipulation and pump and dump. it is done easily and you can see it in many altcoins out there. but after some numbers like above $1000, things change. it become a lot harder to proceed. pumping becomes impossible and at that point you need real adoption to maintain the price and as i said without any usage it won't last a minute.