man, the sports forum is a death sentence for any topic...
NBA teams will always give college coaches a try out, the turn over rate for NBA coaches is still high.
The way for a coach to be successful nowadays, is to have a popovich like structure. Have final say in FO decisions, great working relationship with the franchise players, and deflect attention away from himself.
and to win.
getting a good coach is only part of a winning solution, good players, fiscal responsibility, great scouting, good trades, and great training staff are very important.