This doesn't sound sustainable at all. A billionaire only needs so much gasoline, food, medicine, TVs...
Collapse of entire industries will happen way before we even get a chance to see industries reinvent themselves to cater to billionaires. Don't believe me? Just look at what happened to the economy during the pandemic.
Yeah of course industries will collapse. 100 car factories will close, 5 superyacht factories will open, tying up the same amount of productivity. Owned by the same guy.
There will be tons of spacecraft launchpads, private jet hangars, etc.