I've maintained that Jerel Worthy can be an effective NFL player. I'm not worried about him not lighting it up his rookie season. That's fairly typical, and I kind of expected it with him. With that being said, he was still decent at times, even while learning a completely new scheme and being played out of position, at times.
He's not an elite talent. Let's not kid ourselves. However, he had the potential to be a very effective penetrating pass rusher. He's quick, stout, and somewhat of a technician. He would likely be even better in a 4-3 defense, as he would have more opportunities. The main thing I worry about with Jerel Worthy is his opportunities, even if he can return 100% healthy (which probably won't be this upcoming season). The Packers now have a number of pass rushing only (at least close to only) defensive linemen, such as Mike Neal, Jerel Worthy, Mike Daniels, sometimes BJ Raji, and perhaps another will surface. This doesn't leave many opportunities for basically two spots in the nickle and dime packages. One can also add Datone Jones in that mix, as well. It's crowded, to say the least, and it's going to be somewhat difficult to get reps. I don't think Worthy at defensive end is the greatest idea most of the time, especially with Datone healthy. Perhaps he could work himself into that role, but I'm not really expecting it. If he could just focus on getting healthy and becoming an effective pass rusher, he'll have a spot on a team for several years to come.
My guess is if he doesn't stay with the Packers, he'll find his way to a 4-3 team and be a decent defensive tackle.