They all already have multiple mansions. A playground for the rich with enough workers still left along with robotics to get things done. Not saying that's what's happening. Just saying it's feasible. How many people would it take to build a few Lear jets per year? One refinery. Repair a thousand mansions per year and build a few new ones. A dozen yachts per year. Raise 25,000 head of wagyu beef cattle. etc etc. One country, China, currently makes most 'stuff' for the entire planet. A few thousand workers in MX, CA and the US make most vehicles used by millions in the North America. Movies like Hunger Games & Elysium are plans.
“Movies like Hunger Games & Elysium are plans.”
They are the plans of arrogant people, who have been reliably self-destructing for millennia. The LORD sees to it!
May the odds be ever in your favor.