WOW GOLD-Who can be a Tank instead of Warrior

Right now I have two level 80 tank/DPS hybrid toons in epic gear. Now, when I leveled my Warrior to 80, and for the first few months, it seemed like everyone and his or her mother was a tank. There were Druid tanks everywhere, every Paladin and DK was a tank, and of course there were plenty of Warrior tanks to be had. There were so many tanks, in fact, that I figured that after my months of service to my BC guild about cheap wow gold, I could take a vacation and be DPS for a while on my Warrior. Sure, it ended up requiring me to learn a whole new set of skills, but I got to be the Titans Grip DPS Warrior I had longed to be ever since I saw my wife romper stomp her way through Diablo II get World of Warcraft Gold.

Fast forward a few months. Ulduar is more or less on farm, the new Argent Tournament raid and five men are in effect, and I have leveled and geared out a DK for both DPS and tanking. Based on my experience as a Warrior I was not expecting to have many opportunities to tank. Instead, not only is the DK in crazy demand for tanking, I am constantly being asked to tank on the Warrior as well! Since I like tanking to get World of Warcraft Gold, it is not a major concern, but what confuses me is, where did all those Warrior, Druid, DK and Paladin tanks from launch go?