Large societal changes are fairly rare events. Personally I think the next stage is a new form of worker revolt, some new spin on Unions or Communism, the next Marx has yet to write his magnum opus yet though. Those words are still viewed as bad in the West, so it will need new terminology too.

And to be clear, I don't ascribe to communism or anything, I'm simply speculating that some sort of new ideology, with a focus on the common person, will arise in the next 50 years to direct and fuel the next revolt. You'll know it when you see it.