... it could tax land (owners or renters)...
This ^
Except that land taxation always taxes owners not renters.
There is a carrot to land taxes I'm on a mission to point out to people (see my blog link) but I also think Bitcoin and anything that makes it easier for more income, purchases and wealth more difficult for governments to keep up with also acts as a stick towards a means of public revenue that's been staring them in the face for a century and more!