While your general observations on the source of the problems with prot warrior DPS are correct (and I think universally agreed on) this thread and the others on tankspot (and even some on the official forums) are not discussing that, but rather are littered with ideas that would buff sustained prot warrior DPS without increasing burst damage now, to patch the problem until the reset at 4.0. The question is which one(s) would work the best, and which one(s) will the developers use (or do they already have a different solution). None of them require reworking anything major, like rage usage or heroic strike.
Q. Following the upcoming protection warrior PvP nerf, do you plan to make our abilities focus on doing threat instead of damage?
A. We are applying threat modifiers where we nerfed damage. We'd also like to boost sustained protection warrior damage (for PvE) without adding too much burst (for PvP).