Plus, we don't have to be too draconian about solutions. For example, we can and should mandate that no new vehicles above a certain weight, and no new small jets, should be produced. The ones in existence we leave alone, and let decay take its course. The same with billionaires: leave them alone, and limit the next generation.
I'm happy to hear criticism, but bear in mind that I'm rather attached to this idea. It's novel, as far as I know, and I think it could satisfy both hard-core capitalists AND environmentalists, which is a rare thing. So please, try to offer ideas to improve it. As for the right Enough number, I think for me it's about 10M 2023 USD. I'd like to get to a point in human history where everyone can get there.