As an aside, that won't happen...on the mention of Bitcoin Cash...IF and this is pretty much a philosophically impossible IF, Bitcoin Core (BTC) WAS to propose a block size increase
to say 32mb as a HARD FORK...that IMHO, would be all she wrote folks for Bitcoin Cash...would be having their cake and eating it too...
AGAIN, that will likely never happen, *unless needed for some catastrophic unplanned fork*...but I mean, from a thought experiment point of view having you block sized pumped
up to say 32mb and also have seg wit and lightning....would really toss a wrench into BCH. (then again odds are eth would surpass BTC and BCH before that ever happened)..
ah well....just a wild thought