That is unquestionably a concern. I think you overrate it, though. Having more diversity in working hours would often lower latency, as there's someone available during off-hours rather than having huge gaps. We're also already dealing with a certain amount of distribution with timezones in (sorry for the cliche) "our increasingly globalized world" - I don't see that spreading that around more is going to cause more problems than it solves. As pointed out elsewhere, spreading out peak usage of things like roads and electricity provides significant benefit.