Fair point. It may be that an effort at a better developed proposal would pay off in terms of consensus to implement it. I'm not sure about that given the conflicting and increasingly entrenched interests, but it's possible for sure.
My guess is once rubber hits road, when blocks are actually filling up and fees start to get bid up, it will be an easy choice. Same with full node incentives: once there start to be issues with large block propagation, miners will start to work out payment agreements with nodes, say, and it will all seem obvious in hindsight.