Waiting tables in Hollywood is never the reason people take up acting, and yet so it goes.
Anecdotally, I know several full time top 10 grads who aren't exactly on the fast track to the c-suite, and I assume this is even more true for the broader pool of MBAs.
Aren't you being overly restrictive in scope here? Many executives are MBAs, but most MBAs are not executives.