You might want to rethink "just about all" and also the basketball equation as Nebraska basketball did have a pretty special season when they made the dance.
Not saying men's basketball and football have been stellar, especially based on the athletics budget, program etc. but please back up your claims with data vs "just about every".
I would have to agree with Bill C2.0 on this one, lets take a look at this over the last 15 years. I would say a special season in football would be a BCS, Bowl or Conference Title, in basketball a conference title-regular season or conference tourney or a sweet 16 appearance. Fair enough?
Special Seasons:
SEC Football: Bama, Auburn, LSU Florida, Georgia Basketball: Kentucky, Ole Miss, Miss St., Vandy, Tennessee, A&M, Missouri
Omissions S. Carolina, Arkansas
Big Ten Football: Ohio St., MSU, Wisconsin, Penn St., Michigan, Iowa Basketball: Illinois, Purdue, Indiana, Maryland
Omissions: Neb., NW, Rutgers, Minnesota
ACC: Clemson, FSU, Va. Tech, Geogia Tech, Wake Basketball: Duke, UNC, Syracuse, NC State, Miami, BC, Virginia, Louisville, Pitt
Omissions: NONE
Big 12 Football: OU, Texas, OSU, KSU, TCU, Baylor Basketball: KU, ISU, WVU, Texas Tech
Omissions NONE
Pac 12 Football: Washington, Oregon, USC, Utah, Stanford *ASU 07 Share of title Basketball: UCLA, Arizona, Cal, Colorado, WSU
Omissions: Oregon State
So from what I can see in the last 15 year are so there are only about 7 teams in the powers 5 conference that don't have a "Special Season" in either football or basketball.