Wouldn't a decent portion of the land value tax just be passed on to renters in the form of higher rent charged by their landlord?
"A tax upon ground-rents would not raise the rents of houses. It would fall altogether upon the owner of the ground-rent, who acts always as a monopolist, and exacts the greatest rent which can be got for the use of his ground."
- Adam Smith, Wealth of Nations
"It is in vain in a Country whose great Fund is Land, to hope to lay the publick charge of the Government on any thing else; there at last it will terminate. The Merchant (do what you can) will not bear it, the Labourer cannot, and therefore the Landholder must: And whether he were best do it, by laying it directly, where it will at last settle, or by letting it come to him by the sinking of his Rents, which when they are once fallen every one knows are not easily raised again, let him consider."
- John Locke, "Some Considerations of the Consequences of the Lowering of Interest and the Raising the Value of Money"
It's known that land tax together with similar antimonopoly taxes can't be shifted. What's nice is that not only this type of tax doesn't slow down the market, but on the contrary makes it more effective. Essentially without rent capture (antimonopoly tax) there is an open sink in the economy, so no matter how hard people work, all this value exits out of the economy, mostly in form of parked money in real estate.
As George predicted, all technological progress will just yield higher real estate prices and everybody will be working even harder than before.
I agree a land tax would push the owners of vacant lots to develop them. But, the NIBMY owners of single family homes will still fight against the building of new apartment complexes and try to constrain housing supply (to prop up their property values). I certainly would hope that more apartments would be built though!