Anyone who thinks wealthy people willing part with any amount of wealth en masse hasn't studied history.

One of the reason democracy has tended to be a stable form of government is that it naturally finds a balance between the haves and the have nots -- the boundary where the haves are comfortable parting with that much to live in a stable society where they keep the remainder, and the have nots are afforded some amount of social services for their most accute needs.

That's all predicated on a "or riots / internal military action" alternative though.

We've lived through a pretty stable post-WWII economic bargain period, and historically there's not a ton of certainty that continues through distributive renegotiations, which tend to be bloody.