Let's see where this gTLD thing goes. I can probably see an ICANN or EU intervention in case of a self-mandated requirement of this kind. But, as long as the market stay healthy, more competition can't be nothing than good.

After all, DOH is mainly a technical answer to hijacks (and monitoring). Some ASes seem to have a policy on that... Once it's ready, if it's enforced, you'll have a way to provide a custom resolver you control.