So the idea is to make cities denser? Is maximum density use what we really want? What about industry, data centers, etc., that could be built in rural areas - wouldn't that push land value up there a lot?
And if they are doing that, the taxes should go up, since there's some previously unrecognized value to the land that's driving industry to need to build there specifically and not somewhere else they can buy at preexisting market rate.
Of course, the same also applies in the other direction: if an active mine shuts down and sells for pennies, taxes for the surrounding land should go down based on that.