Solich, Pelini and Bo all had similar career arcs at Nebraska — start OK, field your best teams for 2-3 seasons, get worse, get canned. Riley's even took a similar, though shorter, arc.
Start OK
Frank's first season (9-4) had a few heartbreaks in it, and the young team lost some tight games. His QB room was a mishmash of injured freshmen and sophomores and walk-ons.
Callahan's first season (5-6) was a result of trying to fit round pegs into square holes. His QB room was virtually empty.
Bo's first season (9-4) felt good at the time despite getting boat raced by Missouri and Oklahoma. He had a decent senior QB who wasn't quite enough to beat better defenses.
Riley's first team lost six one-score games (this isn't new to Nebraska), but played hard and dominated UCLA in the Whatever Red Box Chicken Bowl to give us a sense of hope.
Best Teams
Solich went 33-5 between 1999-2001, won a conference title, tied for two division titles, and played for a national championship. He had a Heisman Trophy-winning QB at the helm.
Callahan went 17-9 in 2005-06, won a division title and won an Alamo Bowl against Michigan. He had a Big XII Player of the Year at QB.
Bo's best teams won division titles in 2009-10, and didn't get embarrassed. He got by in 2009 with poor QB play because he had a Heisman-level defensive tackle and other all-conference level players on that side of the ball.
Riley's best team actually was a mirage, but looking back on it, the 9-4 season in 2016 was better than anything we've seen since, even with the woodshed beatings by Ohio State and Iowa. He had a healthy senior QB until the OSU game. A walk-on started against Purdue and Tennessee, and Armstrong played on one leg against Iowa.
Downfall
Solich started getting boat-raced in 2001, and the trend continued until the 38-9 home loss to Kansas State precipitated Pederson's pouty pronouncement that we would not gravitate toward mediocrity.
Callahan's final team gave up — with the notable exception of that 73-31 pasting of K-State. He was officially gone after losing 65-51 to Colorado.
Bo's teams never gave up on a season — they just started giving up in individual games against any opponent with a pulse, starting with the 2012 twin embarrassments in Indianapolis against Wisconsin and in San Diego against Washington.
Riley was on thin ice as soon as we lost to NIU, and then Northwestern in OT at home, surrendering a lead in the fourth quarter. The subsequent beatdowns by Penn State, Ohio State and Iowa simply hastened the inevitable.
Ironically, Frost has broken this cycle by fielding consistently poor teams. These last six weeks have given us some hope, but until the season is over, we won't be able to say if Frost has us in the "Best Teams" part of his cycle, or if it will ever happen for him.