I hear what you are saying about "winning" records, but by winning I should have clarified. In the 1979-89 time period it was so rabid because the team won big. Final 4, conference title, another Elite 8 appearance, a total of 4 Sweet 16 appearances if my math is right. 10 NCAA tournament appearances in 11 years. That is big-time winning and creates fans forever. Those fans who are still alive who experienced it, and the younger generation has not had 1 of those years that they can remember in their lifetimes. Ever. The football program in that time has had enough big moments interspersed that a new generation of fans that grew up knowing only KF are hooked for life as well. Big 10 titles in 02 and 04, the 09 season with Orange Bowl win, 12-0 regular season in 2015, division title in 2021. Those are lasting memories that fans don't want to miss out on.
I don't know what the answer is for basketball, other than having a breakthrough of a Sweet 16 or regular season conference title. I'll always cheer, but not super-optimistic as Iowa just finished having the Player of Year (Garza) paired with another NBA player for multiple years (Wieskamp), who were preceded by another NBA player (Cook) and through to a potential lottery pick (Murray). And what is going to be the sum total of that talent that doesn't come around to Iowa very often? A top 4 conference finish, an appearance in the Big 10 tournament semis, and several second round NCAA tournament exits. Not bad, but nothing that gets people hooked for life.