Call to Arms, is it a blunder that Blizzard will later have to take away or is a legitimate solution to the long ques experienced at the higher levels. In Wrath I only had one level 80 character throughout the most part of the expansion. The character was a paladin. I leveled the character as protection for the instant ques. When I leveled the paladin I had a friend that was already raiding with his paladin tank. So I didn't have to fail much to learn how to tank. I had an external resource to help me along the way. Now when cataclysm hit I wasn't comfortable tank the randoms off the bat so I leveled to 85 and geared up my retribution spec. Now I have a heroic dungeon geared ret spec and only a half geared Tank spec. For me the wasn't worth the extra responsibility of tanking randoms and I instead relied on guild mates or sat through the 45 minutes ques. With this new feature I would have more of an incentive to run the randoms as tank rather then dps. If more hybrid classes now use their tank spec rather then their dps spec then there will be more tanks then before. Conversely there will be a lot more tanks that aren't skilled or geared enough to run the random heroics in that role.
I can see both sides to the argument but I don't think we can make this off as a fail just yet. I feel that this could be a legitimate solution as long as we let it run its course for a little while upon release. I think that the problem with fail tanks will surface immediately upon release but will shortly correct itself when those tanks get a little bit better gear and more experience under their belts. I will stay optimistic about this change until it shows that it wont work. Until then i will run with my pally tank and reap the rewards while they last. Stay safe and have fun.