As the title says, what incentive does a POW miner have to mine on the hybrid POS chain? They would, effectively, be removing their own economic incentive from the consensus mechanism. I understand the long term benefits of a POS consensus mechanism, but a miner has no incentive to want to switch until the last possible moment, or when POW simply cannot keep up with the needs of the network.

Might this cause a fork where one chain remains 100% POW and the other chain has a hybrid POW/POS model?