Exactly. These people don't realize that "try it" really means "switch ahead of the time when we force everyone else to switch." There's no opt-out because everyone is going to be switched sooner or later, whether they like it or not.
It is still useful when the new version have problems. It took some time before Google finally removed the old Google Groups, and they made it easy to switch back and forth during the meantime.
Well, if they mean "switch ahead of time", then they'd better say so - instead, if they are saying "try it", then there is a misleading implication "choose which one you prefer" which in this case apparantly is lying to the users.
