We moved from each city had its own time to timezones because of the need to make sense of railways time tables. Generally speaking, because people started to travel faster and more often. I'm not sure there is a reason as compelling as that one for the general population to approve a global switch to UTC. Furthermore when I know I'm landing in Sydney at 6:40 AM local time in August I know it will be chilly. With UTC I'll have to do some math. Quick, is that night or afternoon? 3, 2, 1... Time's out.
