Nope. So far, automation has been about efficiency not liberating oppressed workers. I don't think that will change anytime soon. Millions of people endure 'mind-numbing boring work' because that's what they need to do to survive. Do you really think they're going to view their replacement as a reprieve from their oppression? They aren't paid afterwards, they're put out on their ass.

In a society that demands employment, 50% unemployment is a death-sentence. That's half your population draining the subsidies dry and raising taxes on the working half. Suddenly both sides are angry. Prisons become overburdened, people dead in the streets, Governments overthrown, CEO assassinations, etc.

Sure, in a fantasy land where things don't cost money and land isn't 'owned', 50% unemployment could be ok. Unfortunately that's not us yet.