Well, it looks like “Hearth Warming Eve” (in which she has a bit of a cameo, but does not speak) is slated for this morning. I expect to see Derpy there.
It’s possible the missing-from-iTunes thing is caused by something else.
I suspect the level of outrage from some of the adult fans is not something Hasbro wants. If they’re concerned about stereotypes, they could redub her voice in that one shot (to de-Derp it a little) and carry on. Or they could redub the name as Ditzy or even Bubbles. (I wouldn’t have a problem with that. Actually, Bubbles would be a cute little shout-out to an earlier Lauren Faust project.)
There’s also some speculation that the removal of the name was not due to outraged parents, but a fear that someone from 4chan would claim ownership of the name, and demand royalties or some such. (I could actually see that happening, though I don’t think that person would have a legal leg to stand on.)
Roger: MLP:FIM exists in a weird sort of alternate universe. Creator Lauren Faust was trying to sell them a non-lame series for which they could gin up a new toy line; they counteroffered with a new version of MLP, and she turned in a universe that met all their marketing requirements without treating the audience as, well, a bunch of little girls. It quickly became apparent that they were getting the number of children they wanted, plus a nearly-identical number of, let us say, non-children. Productions, which already had been incorporating classic Warner Bros. cartoon tropes, started going well beyond that: there was one episode this year with a nod to The Big Lebowski, and another with a production number that was modeled after “Ya Got Trouble” from The Music Man. By this point, not watching it was not an option: I have to see what the heck they came up with this time.