As a counterpoint, it is possible to distribute windfall profits from natural resources in an equitable manner, and keep a functioning democracy. http://freakonomics.com/podcast/how-can-tiny-norway-afford-t...

It is rare, but not impossible.

The view outlined in that video is that the systematic inertia brought by greedy self-centered assholes is nearly impossible to put a stop to by replacing just one person, ergo I take it to mean, that the only realistic way of implementing a sharing scheme has to start with a bloody revolution a-la the French Revolution. Or, of course, we can also just kill off enough people (middle-class and lower only, of course) so that the few remaining ones have guaranteed jobs maintaining the robots (see: Stalinist Communism).

In any case I predict the next few decades will be pretty exciting for future historians. The "A Song of Ice and Fire" kind of exciting.