I wonder if, with your proposed system, we should start working towards something between full employment and retirement and let it be a significant epoch of life.
I've always felt like 45-55 should be a time where you should be heavily incentivized (if not outright subsidized) to give back while you've still got the juice in you.
Not sure where I'm going with this... Just a thought
In my case, I view retirement as being "financially independent" where someone doesn't have to work in order to obtain food, shelter, and health care.
At that point, there's always volunteering, artwork, inventing, watching grandchildren...
That being said, the "I get to keep everything, screw everyone else" mentality is a major problem, because it's hard to quantify how much of our earnings are a result of social investment. (IE, how much of your earnings result from taxpayer/debt supported education, roads, research, and other investments is difficult to quantify.)
Take the now useless people and get rid of them. AI will effectively usher in a new era of eugenics in which your right to live is determined by your economic value.