Corporations exist mostly because of consumerism, though. Once those "humans" are not able to work and in turn, spend their money buying crap from corporations, then...?
In fact, it would seem that things like home fabrication become more capable as robotics become more advanced and inexpensive. So maybe workforce consolidation will directly lead to this.
Or, more likely, this is just wishful thinking.
The problem is that self-interested thinking doesn't often benefit the whole. Every corporation is in the right for cutting costs, reducing tax burden, and getting as much profit as possible (and keeping it!). Without a strong government to form and enforce public policy, the private sector creatively destroys itself and society every few decades, while the rich keep their cash.
Some on HN the other day speculated that the fiercely autocratic Asian governments are the only way to reign in the power of major corporations. I think there is a point to that.