Nobody will be stupid enough to run segwit2x code, and those that do will pay, just like they paid with Buggy Unlimited crashing. It's only a matter of time they get exposed for being amateurs. Meanwhile Bitcoin Core will continue being the most robust and stable software.

If Bitmain is stupid enough to hardfork into the NYCoin, whales will dump and crush NYCoin. It's as simple as that. There will be no stupid hardfork to 2MB backed by unsafe code.