A few random thoughts:
Trying to put a positive spin on this, Hughes was a decent recruit out of high school who had a Big Ten offer from Iowa. I think he can get the job done as a primary back, but we won't have any top end break away speed at RB this year.
Wadley was hurt a lot during last year, which was a reason why he didn't get as many carries as some had wanted. For instance, he did not practice the entire week of the UAB game. The poor guy has not been able to stay healthy any year that he has been here and given his history, we were probably looking at having to play without him at some point this season even had he started healthy.
Wadley was our top play maker, so losing him is a really big loss, but another negative impact is that losing him now also places a lot of pressure on our other RB's to stay healthy, as we suddenly become razor thin with experience should anybody else get hurt/banged up.
Had Fields stayed, he would now probably be in line to get a number of carries this season. If his primary reason for leaving was due to a lack of potential playing time, then I wonder what he might thinking today?
This is next year's worry; but depending on how this year plays out, I wonder if Wadley will look at going somewhere else next year as a Grad Transfer. Especially if Hankins were to assume the primary starting role this year and some other school gets into Wadley's ear that he could be their full time starter next year.