Dont you see Bitmain creating alternatives such as Litecoin, Bitcoin Cash, and NEO? Jihan has all his balls in play to capture all the outflow and using relativity to extract our money from us.
Interesting that you exclude Ethereum, which would likely be the primary recipient of outflow in the event of such an attack. Currently POW, but with all the adderall that Vitalik is chugging, he's bound to jury rig something at least mostly functional. The point is, if the headlines read "Bitmain steals Segwit coins!" rational people are not going to move into another Chinese coin.