Sure there's alot of entertainers, but most of them will struggle without making decent money (just like today).
There's a reason I said 20 years. In 20 years, most of baby boomers wealth will have disappeared. And so the eldercare/health industry will collapse then.
And remember there will also be alot more robots/vending machine/teleremoting help desk doing services, reducing human needs.
I also think there will be an army of people caring for others - the elderly, children, the sick.
I do not believe that the 6% of people you think will have all the money will just buy more stuff with their money. They will buy other people's time instead and that's why your 80% group will be more like 25% in my view.