If Mike was a man instead of a petulant little child, he'd just carry on with his fork and further break compatibility. He'd do as he said he would and do it with checkpoints and miner minority, or even changing the PoW. But then he'd have to do actual work in his fork and Gavin isn't doing much at all either. They'd fall so far behind it would be a lot of fun.

But he's all bluster, and his word is worth fuck-all.

There you have him being himself:
https://www.youtube.com/watch?v=DB9goUDBAR0

Blah blah blah. Coward.