Basically, I have been reading a great number of threads from tanks and healers and from what I see most of them are bailing on the idea of running randoms entirely in favor of guild only. It seems tanks are fed up with the WOTLK dps style players failing to CC and attacking random targets making their lives miserable. Jump to the healer forums and you see healers complaining that they are not currently setup to spam heals on dps who ignore dungeon mechanics (ie: not getting out of avoidable damage).
I wonder if enough tanks and enough healers will abandon the LFD heroics altogether making dps queue times 30min plus, or if they will join and the second they realize they have the WOTLK dpsers quit the dungeon. I just don't think the WoW community has the overall patience to push through the 3 hour dungeon fails while people relearn their classes.
I myself am a resto shaman and will continue to queue, but I hear stories on my server of people already giving up.
TL DR - Is LF Heroic Dungeons going to die or force dps to wait in 30+ min queues? Your thoughts.