I do agree with the negatives, but at the same time, I do see some upside. I live in a cycling city, and need to rent a car maybe once a year. why then should I bother myself with the annoyances of vehicle ownership?

Done charitably, I think the mainframe model of shared compute does meet most person's needs where they don't need to care about latency. It would allow us to take advantage of economies of scale. The problem, imo, is that no one has an incentive to do this as a service, so it would turn into rent-seeking.