If r>g then...?
I'm confused, perhaps the coffee hasn't kicked in yet.
In your Forbes contribution from April...
...you advocate land taxes but not "wealth" taxes. Land is a form of capital, capital is a form of wealth. Income and capital are fungible (since one can extract income from capital appreciation and invest income in new capital).
From my reading (I haven't finished CI21C, obviously) Piketty's most stimulating point is that capital/wealth concentrates until war destroys it. If we want to create a society without war we must find other ways to constantly redistribute capital/wealth or else bad things.
In most of the commentary about CI21C, commentators/ards mix labour income with wealth/return on wealth. Piketty seems mostly relaxed about unequal returns on labour (e.g. nurses vs seven figure bankers). It's not about our salaries, it's about our stuff.