I get that Georgism doesn't tax the improvements. I think we have a fundamental disagreements about how mortgages work. A mortgage doesn't make the bank the owner of the land. Even if we strangely ruled that it did, that would lead to strange situations where as long as people were paying a mortgage they could live tax free on their land. But the minute that mortgage disappeared they'd be on the hook for the tax value.
I don't see a good way to get to Georgism without government absorbing the mortgages as the fallout to the economy of all that debt suddenly having little in the way of assets underlying it is a huge problem. I do agree I exaggerated with my claims of $0 since the improvements on the property would have some non-zero value, but land represents the majority value of most houses and the land value would be effectively reduced to zero by the change in value from the taxation. That would be enough to put most mortgages underwater and the asset would no longer sell for the cost of the mortgage. I don't see government doing this and just saying "too bad, investors absorb the loss".
I don't see a good way to get to Georgism without government absorbing the mortgages as the fallout to the economy of all that debt suddenly having little in the way of assets underlying it is a huge problem. I do agree I exaggerated with my claims of $0 since the improvements on the property would have some non-zero value, but land represents the majority value of most houses and the land value would be effectively reduced to zero by the change in value from the taxation. That would be enough to put most mortgages underwater and the asset would no longer sell for the cost of the mortgage. I don't see government doing this and just saying "too bad, investors absorb the loss".