I was not suggesting turning tanks into dps at all!
though i can see why you might think that, i was suggesting keeping the main tanks as they are now, and creating a niche class that can pseudo tank say 5 targets at a time (or less), this would allow more complex tanking situations without forcing players to play as a tank class, and should be appealing as i assume that most players just play to measure their dps compared to others. So its a dps class with better tanking capabilities than other dps, but less than an actual tank, what with lacking meaningful active mitigation and having a threat target cap.