I'd be more concerned with the loss of Dareus than Ingram. Dareus would be a stabilizing playmaker on that inexperienced (not young) defense. Trent is more than capable of stepping in as the workhorse back right now, having both of them would've just been icing on the cake. The frosh behind Richardson would concern me a bit but remember, Ingram and Richardson played quite well as freshmen too.
As a random aside, I also think there is a greater chance of losing Dareus for an extended amount of time, not necessarily the season, but a suspension seems likely. If he is back by Arkansas or Florida it wouldn't be the end of the world. It sure would be nice to have your pass rusher for the two offenses that will look to test a new secondary.