Worst come to worst - you fork POW to POS/POI/whatever, and don't rely on miners anymore at all, that's true for both, all pow coins really. Miners are here to protect network, not to dictate how much whatever-coin is worth or whether it's viable or not.

The only thing as a coin developer you should care about - are your customers. Your reputation is secondary however, but ideally you should be clear, honest and accountable.