I actually think the stats for the NU defense are almost guaranteed to go down in 2024. There's no way that the shitty offenses of MN, WI, PU, ILL, NW, IA are all equally as bad again in 2024. It's literally not possible.
If White moves after 2024 his best hope is showing a 2 yr track record PLUS some high profile stops at the end of games on national TV. That might help to offset the worse defensive stats in 2024.
(Unfortunately if you watched NU on TV in 2023 you saw the D breakdown to give the opponent the win in the following games: MN, CO, MSU, MD, WI, IA. It'd be nice for White if you tuned in in 2024 and saw the defense making the stand at the end of the game, instead of breaking to give the other team the win)