What do you guys think is the cause of severe lack of Tank users?

[SamRF]

Yeah good luck with a healer taking auto attacks from the boss.
Its one of the responsiblities of a tank to set the tempo of a dungeon or a raid. You don't like it? Then tank. Simple as that. Tanks look at their gear and their healers' gear to then make a series of decisions baised off that information. That is what a good tank does. They dictate the flow of the fight because they are the ones getting hit, and positioning. Everyone will die if a healer dies, but if a tank dies in a raid that doesn't mean the end because you have a second one. A healer dies the other healer will struggle to keep up and recover.

Woah there don't pull a straw man on me. Raids or boss fights have nothing to do with that conversation. We're talking about mob pulls here.

And you're right that's what a good tank does. What if your tank doesn't though? You're standing there spamming your AoE dps as healer with your thick gear, seeing tank barely takes a dent while that next delicious mob pull is just one DoT away, you realize how much dps is going to waste, how much potential is lost with those AoEs missing half their value. Meanwhile you can feel your head starting to doze off to sleep as the 1 button spamming is putting you in a trance. You know full well you can tank that set of mobs for bunch of hits or handle the situation if chaos ensues as healer. Do you pull or no?

Of course you don't, because you don't want to hurt the tank their feelings or damage their ego. Just to avoid a conflict. That's the sad reality.