Comparing Bo's record to Alabama's leading up to their hiring of Saban is questionable, at best. In the years leading up to that hire following the 2006 season, Alabama went:
3-8
7-5
10-3
4-9
6-6
10-2
6-7
People can try to rationalize the point away as much as they want. It doesn't change the fact that if Nebraska fires a second coach with a record most others in the profession would love to have in the span of just over a decade, it will make the job much less desirable to many potential candidates.