I'm not nearly as high on DJ Smith as others are, despite him being a local NC guy. True, he is a fairly hard hitter and solid tackler. However, I still saw a guy that struggled in coverage and I can only imagine that getting worse as teams are able to game plan for him more. He doesn't seem to play any faster than Hawk, and taller tight ends should be able to abuse him, especially with a good QB. Moreover, he's coming off a MAJOR injury, from what I remember. Didn't he break at least one leg bone, similar to Sherrod? I honestly don't remember hearing much about his injury. I don't have much confidence in his availability/effectiveness this upcoming season.
Bishop/Smith would likely lead to a slightly better run defense, but I would still expect them to be just as bad, if not worse in coverage, especially given injury concerns.
I expect to see Hawk starting again in 2013, depending on off season moves.