I would love that. But our organization (not us) has evolved a lot since the hunter-gatherer times. It’s much easier to cope with ostracism.
In the rich/poor separation, It’s quite likely that the rich “phase” (referring to the “phase transition” phenomenon in physics) will likely prefer to separate from the poor one and avoid any painful psychological/moral side-effects. They will be happy to grant themselves ostracism and build internal arguments justifying the situation (poor = lazy/stupid). Something as in the “Elysium” movie, but not so dramatic technically. It’s more or less already the case.
Although this could be seen as an arguable analogy, I feel this is something we, as humans, are well capable of: think of how we deal with domestic animals and slaughterhouses.