I'd say no. The rich won't buy millions of food items or works of fiction or go to every service available in real life.
So, many of those companies won't remain viable unless there's some alternative way for people to spend money. Lots of people who see themselves at the top will end up out of a job, or watch their businesses crash down.
I will say that the fact these societies are (at least for now) still democracies makes the future these tech moguls want less certain for them though. Feels like if there's enough pain from unemployment and declining living standards, someone will run on that and win, whether those in power like it or not. The US may have some issues there, but a lot of the world has seen parties outside the mainstream grow in popularity, including some on the more leftward side of the political spectrum.