Attendance notwithstanding hard to argue that classed basketball hasn't produced stellar basketball talent from Indiana: the Plumlee's, the Zeller's, the Teague's, Etwaun Moore, Juan Johnson, Gordon Heyward, Eric Gordon, Greg Oden, Mike Conley Jr, George Hill, Courtney Lee, Desmond Bane, Trey Lyles, Gary Harris, Yogi, and so on. All of which made it to major college basketball or the NBA at some point. The success of Indiana High School wrestling has not mirrored that of high school basketball.
There are multiple reasons for that - not the least of which is the physicality and mental toughness required to compete in wrestling versus basketball. Additionally, culture, Indiana is a basketball state. From the movie Hoosiers, to the demi-god status of Bob Knight, and successful D1 programs in Purdue, IU, Notre Dame, and Butler.