And I don't believe for a second none of them are aware of the potential disaster described by anonymint, so why are they ignoring it? Maybe they consider it only a theoretical risk that can never happen in practice? It just seems strange to me, that all of them are willing to gamble with their reputation, hoping that nothing goes wrong.
Even if it were possible to do what shelby claims (which I highly doubt), 100% of miners have locked into segwit which means there will be 0% hash power on the old fork because 100% of miners have committed to mine on the new fork.
Basically, the old fork will be dead, everyone having moved over to the segwit fork, so the point would be moot anyway.
Cheers, paul.