I think the key to understanding this proposal is to realize that the state does not have to be a small subgroup of people (or in other words, elite) that it, in effect, is today. State's power is born from the people and as long as it's not centralized in the hands of a small elite who can use it to walk over most everyone else, most of your comments lose their significance.
As for the motivation to take care of the land, why on earth would you be voluntarily paying for it if all it was for you was financial burden?
The value of land to an individual can change due to unforeseen events. When land is property, it is more usually a cushion against changing circumstances. When there is a large tax on your land, changing financial circumstances may force you to have to abandon the land when you otherwise wouldn't, as it has become a liability in this system.
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