That's fine. If we have enough X then stop paying people to build more X.

Late thought: we continue to reward those who built more X when we needed more X, and that's fine too.

The first round of people paid way more for their solar panels though, and those higher prices helped bootstrap the industry. Should people who paid much less for panels get the same reward? I'm having trouble getting outraged about this, it seems to be incentives working exactly as they should.

I agree, and maybe my "ladder pull" comment comes off as too negative. Most early solar buyers were either in it for environmental reasons or for a modest return on investment. I don't think many were expecting a windfall.