[harshreality]

Exactly. It won't catch on because most people will not know what UTC means, and will think you're crazy and eccentric. Most people do not even know their timezone offsets from UTC, and if they did they would consider the strain of applying that offset too taxing. They prefer that the meeting organizer state the meeting time in the attendees' local time. If it's not, and the meeting is important, they'll try to convert it, but they may get it wrong (especially with daylight saving time in the mix).

A great example of this is that most British think London time tracks UTC even during the summer. You talk to them about meeting times in UTC, and they'll be an hour off as long as London is observing DST.