This is first I've heard someone suggest to go to all one time. But I have heard various arguments for the US to go to just two time zones. East and West. And of course many arguments for getting rid of daylight saving time. We are already on daylight saving time for longer than we are on standard time when they changed it a few years ago.

Then there's the whole ordeal of redeye flights. US domestic redeye flights really only go eastbound because the timing works out to leave late and arrive early in the east for morning connection. But going westbound, there are no red eyes, which requires a hotel. Perhaps with only two time zones, there could be red-eyes going both directions?