Because they are public universities.....and regardless of whos and whats...it isstill the president's ( of the university and board,of directors) call what goes on... and ultimately the tax payer....
Except in the few private universities...usc..nd..etc
If a schools program didnt want to join a conference full time...dont have to ( nd)..
Or add sports, or drop sports (uab)....
The ncaa and conference are not all controlling.....but monitoring and regulating...
You know this...
@TerryP