I think some of this pessimism needs to be countered by the fact that ARob, despite performing quite well this season, is not Shonn Greene. When Hampton went down, a lot of people were equally pessimistic about the running back position, and it's turned out okay. Not great, but okay.
I guess I thought Iowa was already in heavy backup mode at the running back position. I didn't consider it a strength before this, so I'm not as worried about the prospect of Wegher, O'Meara, and possibly Rodgers contributing.
I do expect O'Meara to sub in quite a bit for the rest of the season. Protecting Stanzi in passing situations is an important part of RB play, and one that many freshman aren't capable of handling.