Originally Posted by SlayersBoxerFan
But then people wouldn't learn all the roles sufficiently (which is important for competitive players) and you would also feel forced into playing specific roles. Not to mention I imagine qeue times would sky rocket as everyone wants to play a carry.
Actually, it's quite the opposite. People that want to play a Carry, but want to avoid the 1hr queues, might decide to play support for the instaqueues. That is basically what I did in WoW. I made all of my chars tanks and plowed through dungeons. Even my chars that weren't tanks, I'd have a set just for queuing. And if you want to cheat the Queue and be a carry, you can duo queue with your support :P
Honestly though, I'd hope they do it the way WoW did it with the ability to multi-queue.