Let me clarify: Few in the mainstream of current politics and media want to discuss higher taxes on the uber wealthy (1B and up) - much less the very wealthy (100M and up).
It's only happening in a few places at the state and local level, but that's challenging because of the ability of the wealthy to move residence between states (something the pied a terre tax cleverly works around).
It also seems to have a lot more purchase these days in forums like this. My comment above about raising taxes would likely have received much more opposition 10 years ago. It seems like the consciousness here has shifted, probably because many here have a front row seat to the emergence of the tech oligarchy.