Unless ND radically alters its approach to athletics, what Kelly is doing is about the best we can hope. Swarbrick is content with 8-10 win seasons. We could bring in someone new, someone energetic, etc., but he'll run up against the same thing Kelly has: an inability to bring in top-tier talent at every position of the team on a year-in, year-out basis. We often have premier talent in one or two positions, but never across the board, year after year.
Look at the other strong academic programs: Stanford, Michigan, Cal, etc. Here and there, they may do a bit better than we do, but when it comes down to it, none of these places is going to compete for titles with Alabama, Ohio State, Clemson, etc. The pool of players for Bama, OSU is just so much larger, not to mention their coaches do things like grayshirt, or overlook criminality.
At this point, I consider it a big deal if ND amasses 10 wins. Unless the university begins creating dumbed-down academic paths for players, sort of like UNC did, I don't see any coach coming here and winning a title. Not even Nick Saban.