What are you talking about?  Do you even understand that over 38 years to have this average is pretty freaking good?  Only 16 P5 teams have averaged 8 wins or more over the last 38 years, they are:   Virginia Tech, Tennessee, Texas, USC, Auburn, Clemson, Penn St., Georgia, Michigan, Alabama, Florida, Miami, Oklahoma, Nebraska, Ohio St. and Florida St.
Mostly Blue Bloods can average 8 or more wins per year over this kind of extended period.  Iowa is just behind that group at 7.3 wins per year.  And no, I don't think Iowa is going to move up to a blue blood type program.
Take note of some teams NOT on this list:  Notre Dame, LSU, Texas A&M, Oregon, Washingon, UCLA, Wisconsin.  They are all right around where Iowa is at.  7.3-7.9 Wins per year.