Speaking respectfully as an Ohio State Fan.
From the outside it really appears that you need to change the entire coaching staff. Nebraska is a proud program like OSU and you should expect a high level of performance on the field. You don't need a head coach that chews gum and smiles while his team is getting beaten badly.
Don't accept excuses like "he needs 3 years to build his program" or "once he gets his guys we'll win". Winning is a mindset, regardless of the talent. It's up to the coaches to maximize the talent that they have on hand.
Examples from OSU: Jim Tressel took over a team that was 2-9-1 against Michigan. He went 9-1 against them after that and appeared in 3 NC games. Urban Meyer inherited a 6-7 OSU team with no eligibility for a bowl game, but he won 12-0 in his first year without "his players".
Get a great head coach and you'll see a turnaround in no time. As another example, look at what Chris Petersen has done at Washington.
If I were the Nebraska AD, I would be looking for young, hungry coaches that are succeeding at a lower level.
