The problem isn't really a lack of tanks. Though if they do add a new tanking class I'll certainly level it up. The problem is that after tanks are 50 and beyond darklight there is very little reason for us to queue for anything. I have both warrior and paladin leveled and I have absolutely no reason to get philosophy tomes. So main scenario and low level duty roulette are completely useless for me. They need to come up with far more compelling rewards if they want to convince tanks that these things are worth doing.