So they wouldn’t be able to afford their taxes with a LVT, but they can’t afford their taxes under the current property tax regime (in which land value is also a factor). I don’t see how this is an argument against LVT.

But, zooming out, is it beneficial to society to have empty-nesters, and elderly single people, living in 3- or 4-bedroom houses when there’s a critical housing shortage for young families? Is it even good for them to live in a big house, when a nearby, smaller dwelling that’s cheaper, and easier to clean and keep up? The problem in the United States is that those smaller dwelling units don’t exist at all in most neighborhoods, and about the only option is to move to an “independent living” facility on the edge of town, away from family an neighbors, for $3,000 a month.

It could be a win-win: Elderly owners of high-value land could realize the cash value that’s currently locked up in their houses, while the city could benefit by intensified development of that same land, increasing nearby land values even more. We need to change the zoning code to allow building that missing-middle housing in the same neighborhoods, but if we did that, a land-value tax would help incentivize its construction.