You really believe today's billionaire class will just give up their power over the populace? A world of abundance means the billionaires are irrelevant because everyone would have access to everything and they would never let that happen.
They will hoard the resources, land, anything that is needed for people to stay alive.
Your argument seems to be boiling down to, there's no point to improve quality of life because billionaires are just going to hoard all the improvements.
Surely the problem with that is the billionaires, not the world of abundance though?
They will hoard the resources, land, anything that is needed for people to stay alive.