Omniclasses
Omniclasses are an interesting concept that has been brought up while developing reality gentrification theory, because once you achieve gentrification, everyone is part of the bourgeoisie, but if everyone is part of the bourgeoisie, then isn't it safe to assume that no one is part of the bourgeoisie? Since the bourgeois no longer have a class to exploit, they would become a synthesis class, an omniclass if you will, the bourgeois proletariat, which could only exist once every single individual owns means of production.
That omniclass can't be sustained for very long though, as it still has characteristics of the bourgeoisie and needs a lower class to sustain itself, resulting in the famed “Societal Implosion” where the capitalist and class system collapse onto themselves and evolve into communism.