We lose our entire starting O-Line and D-Line. Lose Rajion Neal, gain Jalen Hurd.
Hurd will be coming off a fairly serious shoulder injury with durability concerns. Based on admittedly limited video.... I am not convinced he's a RB in college.
The O may be a little better if they can find a left tackle... which is a HUGE if because I don't think there's one on the roster who is likely to return next year.
The OL will get thinner but Wiesmann, Crowder, Jackson, et al make a pretty good foundation to have a decent OL.
D is where the real pain will be. Folks only THINK UT is thin this year. Secondary depth MAY be marginally better with the addition of some talented '14 signees. At LB, all three starters plus some back ups will be gone. Maggitt may return to form or not. On the DL, a few decent guys return but there will be zero depth. Major contributors like Hood, Couch, McCullers, Smith, Walls, and Miller will be gone. I am not sure there are enough bodies much less talent on the roster right now to replace them.
IMHO, the O will either tread water or take a small step forward. The D will take a fairly significant step back... and that's not saying they're great now.