I'm totally cool with the idea that now, in addition to tanking we ALSO do some DPSing. An additional challenge would be great. But that's not what they've done, from what I have seen so far in live. What they've done is taken the all challenge out of actual tanking, and if you'd like, you may find some challenge in DPSing instead. I have a problem with that. If what I enjoyed doing most were DPSing, I would not be playing a prot warrior.
DPS is not tanking. It's a separate role distinct from tanking. One class may do both simultaneously, sure. But shouldn't both be interesting and challenging?
I have to confess here, though, that I am not a beta tester and I have seen nothing beyond level 70. Maybe the fact that all the content I'm seeing is not tuned properly for post 3.0 70s is giving me a skewed picture of tanking? I'd love to hear someone tell me that.
Just my 2 cents.