We used to have many walk-on players during the Henson era, some of the teams in the late 80s had more than 10! I recall reading that at some point Title IX caused them to throttle back because it not only looked at scholarship numbers when comparing men/women's sports, but also "participants" which included the walk-on guys. So that's why now you rarely see more than a couple on the roster.
I would have been a toddler back in the late 80s, but weren't all the walk-ons due to some scholarship restriction?