Coaching is an issue for Nebraska, but recruiting is their biggest issue. Nebraska was already at a big disadvantage to other big programs with no in state talent and the move out of the Big 12 to the B1G West made it an even bigger disadvantage. Couple that with the fact you have 3 schools (OSU, UM and PSU) who will out-recruit Nebraska every year and another (MSU) who will recruit about the same -- it makes winning a conference title extremely difficult. I think Nebraska can get to the point where they compete for the West division regularly with Wisconsin and Iowa, but winning the B1G regularly isn't happening unless OSU falls off a cliff or is given the death penalty by the NCAA.
In today's CFB -- you are not winning a national title without elite recruiting. You may have a year where everything goes right and you get to the CFP (see Michigan last year). But the end result is getting drubbed by "fill in elite team". It is why since 2014 -- the average margin of victory in the CFP semifinal is over 20 ppg. The talent differential is enormous between the elite and everyone else.
People mention how i talk about OSU even though I am a Michigan fan -- here is why and to explain to you how big the difference is between a top 5 class and a top 10 recruiting class.
2020 -- UM had the #2 class in the B1G, #10 class in the nation. Our highest ranked recruit was AJ Henning.
If AJ Henning had signed with OSU, he would have been the 10th highest ranked recruit in their class. Think how absurd that is and it isn't like OSU had the #1 recruiting class -- they had the #5 recruiting class nationally. Recruiting today is an entirely different animal. With social media, national camps, etc. -- it isn't going to change any time soon, because now these elite recruits can contact other recruits daily, they can play on national 7 on 7 teams, they can follow them on twitter, instagram, etc.
I have no issue at all with Nebraska. It'd be great for the B1G if they got back to winning 9/10 games and I think they will because they don't have any elite recruiting teams in the B1G West. But to win the B1G -- Nebraska is facing an enormous uphill battle, when you have multiple teams who will be more talented and that fucking team in the Armpit of America continues to recruit like the big dog schools.