By launching BCH Bitmain have increased their influence over the price of each chain as they can manipulate hashrate at will between them both. They've granted themselves a longer period of time in which to milk money out of the sha256 ecosystem and another mechanism with which to do so. Segwit 2x signalling remains above 90%, no sign of it falling away. Core have made their position on segwit2x very clear so I'm not sure why or how you think a negotiated agreement is possible at this point.