- Having warriors only or mostly generate rage from damage done is an intriguing idea that has come up a few times. It would help the problem where better gear leads to rage starvation (at least in lower instances) and where warriors have trouble OT'ing because they aren't getting hit. It might also get warriors to care slightly more about dps stats instead of focusing mostly on survival stats. This would all apply to druids too. This isn't a change we have in the pipe, but it is something we discuss from time to time.
Of course, this would require a real shift in how warrior/druid tanking mechanics worked. It would also have massive effects in PvP: it would essentially break the pattern of design that makes focus firing a warrior in PvP a slightly more risky proposition, since if you don't kill them they'll turn your own damage back on you. (It could also mean that switching to bear as a survival strategy in PvP for druids would become hobbling.) It's a very interesting idea: as a warrior who is currently DPS, I know that rage starvation can be a real issue when you're reliant on damage dealt, any misses or dodged/parried attacks can sink your rotation, so hit and expertise would become even more aggressively important stats for tanks.
There's a lot of issues to consider, but it would make all warriors and all rage based tanks more balanced with each other. No more praying for rage after a dodge streak, no more taking off your pants to run a heroic if you're in raid gear, and more attention paid to parity between DPS and tanking rage use. I'm not sure I want to see so big a change in the game, and I'm certainly hoping they do it right if they do it at all.