In practice, a group of persons (government) controls the land and the improvements that people in general were taxed for.
The group who now controls the land prevents the use of it by the people in general.
I see nothing in Georgian economics that addresses this issue, and this is a central issue from the point of view of people who want to see the land and improvements used to promote nature and the advancement of human skill and values, but who have no means of getting the government to pay attention, even.
To work, the Georgist proposal seems to be based on increasing values in private property. I think this a risky assumption.