Even with lots of talent off to the NBA, these teams instantly reload, whether through highly ranked recruiting classes or nabbing the top players from mid-major programs.

Source: https://www.deseret.com/2023/8/29/23846282/byu-basketball-and-the-big-12-tough-sledding-awaits-cougars-but-how-tough-mark-pope

Plus, it would almost certainly decrease the value of those performance units, money that is is often the main revenue source for mid-major conferences that don’t play major college football.

Source: https://businessmirror.com.ph/2023/03/15/a-bigger-march-madness-many-obstacles-stand-in-the-way/