I think regrettable that Bitcoin cash will replace Bitcoin in the future (1-2 years), at least in price
Bch cash is an improved version of btc, and has 8mb blocks, in the future, if cryptos uses in day of day of real life, btc isn't optimized to make so transactions per second, and i'm afraid.
It's would be myopic to believe that bch would replace bitcoin because of its higher block of 8mb. There's so much factors that come in place in determining the value of cryptocurrency and block size is a negligible factor. The market cap of Bitcoin is quite very high and holds over 40% of the cryptocurrency market capitalisation and bch is far lower than bitcoin in price, value and popularity. Bch still have a long way to go because its only an altcoin that was forked out of Bitcoin.