Apparently, what I looked up was the first year - it was 1974-1975, so in less than 50 years, 1000 wins.
I just don't have the time to look more closely, but I am fascinated. Good catch.
According to Wiki there were 18 teams with 1000 wins at the start of the year, led by Tennessee and then UConn (Geno has over 1000 wins himself). Quite a few mid-majors in the list, either they have played for a long time, were really good once (think La Tech), or won all their in conference games for many years (think Green Bay).
NC State, LSU, KState and Tennessee Tech are all likely to have made it / make it this year, and there are a number that are close. In a list of the top 50 program wins, Washington at number 50 has 863.