Anyone mining should now be smart enough to know that forking ethereum and continuing to mine on that fork is easy. Doing work for ether makes sense. Proof of Stake rewards the pre-mined coin holders, who own around 5/6ths of all the coins now and will be assured that they continue to hold that proportion for doing no work. I doubt there will be much sympathy when one weeds out the mindless worshippers of Vitalik Buterin. There's another hard fork coming, and there's yet another split coming.