Essentially, where is the breaking point?
The answer is there isn't one, so long as Blizzard keeps smart with how they're incrementally introducing it. If they right now offered you a full LFR set, the uproar would be pretty strong.
However, if they first offered you a full basic green set at 100 not many would mind (the forums would again be aflush with "Not p2w, what do you win with greens?", then once that has become a recognised feature, you add in a full blue set - you can then draw on the fact the fallacy that because you ok with the full green that the full blue isn't a big a deal. Rince and repeat.
Remember, at one point, the idea of an in game store was
laughably obscene - now look where we are
I will add though, that for me personally, my breaking point is gear at level comparable with organised raiding since it diminishes the value of the part of the game I enjoy.