A lot of Ethereum users are excited for a solid proof of stake system. The incentive is visible in this thread: people want to feel they're not contributing to wasting electricity.
And the incentive for miners ... well, Ethereum doesn't need them if it has proof of stake, so that part doesn't matter. They don't dictate the rules of the system.
Within the system, they have not. External to the Ethereum network, I expect people heavily invested in mining infrastructure to fight tooth and nail to protect their investments.
