I'm kinda out of the loop as far as WoW is concerned but isn't what you're describing the same thing they already do with the Scroll of Ressurrection [read: reactivate your account promotion] thing?
Last time I was asked if I wanted to reactivate my account I think I was offered a free server/faction transfer and a levelup to 80 for one of my characters [characters with that new class excluded but those have a built-in exp boost].
I also seem to remember a friend who did come back to the game making a new level 1 character and having that pushed to 80 as all his other characters were already at 85 at the time.
So really all they do now is make the service accessible to everyone, not only those who were gone from the game for a certain period of time.
This is not a push to endlevel as some seem to misunderstand, endgame is still an expansion away. That's enough time to get acquainted with the class.

Actually, how is what we're discussing here that much different from people FATE grinding to 50 in a matter of days and only knowing how to aoe?

Experience with the character shouldn't even be a factor as far as that game is concerned. The game used to be really accessible, there's a plethora of guides and addons out there to help those who need the help and, at least when I still played, LFD folks were all either overgeared or terribad with a handful of reasonable people inbetween anyway.