We can do this locally.
Pirates from 1958 to 1992, a period of 35 seasons.
3 World Championships
10 first place finishes
6 second place finishes
10 losing seasons.
From 1993-20012
1 second place finish
20 losing season.

Pitt Football
1973-89
1 National Championship
1 losing season
11 winning seasons in a row.
Ranked at the end of the year 9 times, including 6 times in the Top 10 (Only 20 teams were ranked then)
1990-2013
10 winning seasons
3 teams ranked at the end of the year, none of them in the Top 10, with one being ranked 25th.

Duquesne Basketball
from 1920-21, to 1972-73, 46 winning seasons out of 50 (no basketball for 3 years during WW2), including a stretch of 34 of 35 years.
From 1975-76, to current, 8 winning seasons in 39 years.

The mighty can indeed fall. Ask any Michigan football fan.