> And how can they afford the $30k/yr property tax?
The suggestion is to make them no pay that annually in cash, but rather on the future gains of the house.
Their house (or rather, the land) is going up in value far more than that per year. Asking them to forgo a fraction of their speculative real estate gains, when they never even plan to access it (according to you), does not make sense.
So what it seems like you are really saying is that they deserve to have full speculative real estate gains accessible to them, just because they are wealthier than younger people and were able to get into the capitalism game earlier. That due to their unearned wealth, that they did nothing to create, that comes purely at the expense of others being able to live in the area because land is zero sum. They should have to pay less just because they have greater power? Absolutely not.
Saying "I'm so wealthy that I can't pay taxes, and I'm not willing to even delay paying taxes until sale" is fundamental wrong-headed.