Listen, we should fake a catastrophic collapse, send all the billionaires into their bunkers (if they do not have a bunker, the state will build them one). Once they're siloed off, control all information coming into the bunkers to maintain the illusion of the apocalypse. Meanwhile, we clean up the world and dismantle any vestiges of capitalism, build utopia etc., at which point we make contact with the now feral remnants of the billionaire class, tell them everything we did, show them around a wonderful world free of want and pain, make them confront the fact that they were the ones holding humanity back.

spoiler

And THEN we put them up against the wall.