I would argue that recruiting dropped as a result of the move to the Big 10. We used to have up to a couple dozen kids on the roster just from Texas, many of them huge contributors to national success. The traditional south recruiting grounds dried up after we moved, and we didn't replace them. Said it was going to happen at the time and was roundly poo poo'd.
If we had been in the Big 10 in the 80s, 90s, and early 2000s, would we have gotten Aaron Taylor, Rex Burkhead, Aaron Graham, Kenny Walker, Junior Miller, Broderick Thomas, and Turner Gill? Of course not. Texas has provided more All Americans at Nebraska than any other state besides Nebraska, but that was all before the move to the Big 10. Since the move to the Big 10, Nebraska has had only ONE consensus All American from ANY state: Levonte David.
Yeah, we still sign kids from the south, but nothing like we used to, and most of the ones that we do, don't stick around.
We left for the Big 10 for better stability and more money, so that we could be comfortably mediocre from now on.