As for the political difficulty of passing the others, I agree, and I think that’s the big fight here. But I think it’s winnable, after a lot of grassroots and maybe an election cycle or two.
I’d say the next shot for it would be after 2045, which is when the senior citizen voting group starts to shrink for the first time. And even then, the bulk of the taxation will fall on the middle class.
So, good luck with it.