We didn’t have to worry about the defense under the old rules because the program always had players developing alongside returning veterans- that is, when someone graduated there was a player with 2 or 3 years learning the system as well as development in the strength and conditioning program. This recipe was spiced with some incredible players who started as freshmen like Eric Weddle, Jaylon Johnson, and Clark Phillips.
Now we are losing both starters who would have returned to anchor the D as well as players in development and replacing them with players from G5 programs and P4 programs where playing time was not available. The coaches will have to make do with players having less time in the program.
Will this recipe be as good as in the past? Time will tell. There is no point in being worried about it but some level of skepticism may be warranted.