Miners are completely fools imo. There are so stupids that they are not only act against their own proftis but against their economical future survivor.
If they had activate segwit bitcoin will be much higher in price and bitcoin ecosystem will ha a huge innovation atm.  And innovation means money to everyone especially startups and miners. They will be even in e much better position for a hard fork future proposal.
But what choose this "brilliant" mind? to stall bitcoin and risk a not consensus fork that will create an economical disaster to the whole bitcoin ecosystem.
Especially Bitmain will hit hard from this economical collapse because is one of the Bitcoin mining startups that are heavily exposed to bitcoin ecosystem. They have invest huge amount of money to bitcoin startups and of course to btc mining.