I think the declining BTC value of BCH indicates the market is pricing in the increasing odds of 2MB Bitcoin blocks becoming reality.
Which actually makes zero sense, because in the minds of BCH supporters if 2MB blocks are just ok then 8MB blocks are even better. Which Bitcoin Cash already has, right now. And apparently they could give two shits about SegWit support, bug fixes or enhancements, replay protection, real mining support, merchant support, exchange support, real economic majority support, or anything else to support... ya' know, an entire $70B cryptocurrency ecosystem.

But let's be real: their goal was never to create a 'better Bitcoin'. It was to hijack and derail Bitcoin. And until that goal is achieved, the forks will just keep a comin'.