Of course miners can keep their PoW chain going. That doesn't mean anyone else will care about it, or that they can stop the PoS chain from going live. There h

Of course miners can keep their PoW chain going. That doesn't mean anyone else will care about it, or that they can stop the PoS chain from going live. There have been lots of Ethereum forks, but ETC is the only case where the old chain stayed active. In every other case the old chain was abandoned. (Bitcoin on the other hand has multiple active chain splits.)