Henry Ford famously wanted his workers to be able to afford his cars. When Bezos replaces everyone with robots, who will be left to buy his junk?
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Look at street markets in countries with high wealth disparity. The well-off wouldn't shop or eat there, and they certainly wouldn't invest in a street vendor, the vendors are meant to serve the needs of people in poverty.
See Citigroup's plutonomy paper[1] that explores what that would look like and what investment strategies investors should take. The tl;dr is that the formal economy will abandon lower classes in favor of making a ton of money serving plutocrats and their friends and families instead.