At some point, Iowa was going to have to play someone at RB. But if you look at KF's comments about about that, he basically laughed when people asked him about running Rogers and said something to the effect of, let's pray it doesn't come down to that. Last year is just not a good indication because Iowa was close to being down to no backs. Could they have pulled the RS? Sure. Did they? No.
When you fast forward to this year, things are way different. Iowa has two highly regarded freshman RB's. It just isn't the same as last year. I would expect either of these guys to get the shot first if need be instead of converting Rogers. Also, by some people's accounts, it sounds like Morse could have been nicked in the AZ game.