I think there might be a dump this friday/saturday - the BTC difficuloty retargets, and I expect the difficulty will get higher and miners will then move to BCH, which then has the effect of building bitcoin's mempool and fees again.
Didn't Bcash hard fork to make the difficulty retargets less volatile? I don't think it has those drastic drops anymore, which is supposed to prevent those periods of hyperinflation where miners are producing blocks every minute. So, that should mitigate things a bit.
Also, Bitmain (or whoever the spammer is) has been attacking the network with spam for days/weeks already. I guess it'll take priority fees from the current 150k satoshis per byte to.... 500k or 750k? It sucks, but I think people are starting to see through the manipulation by now. And Bitmain doesn't have the "rational miner" excuse regarding Bcash's EDA anymore.
This will keep happening because there is now competition for sha-256 miners (which there wasn't before).
There have always been other SHA-256 coins. If you look at Bcash's hash rate, the vast majority is Bitmain (the lone unknown miner and its proxy, VIAbtc). Bitmain is trying to manipulate people into believing that "miners" are moving to Bcash. But it's just Bitmain.....