He also picked Sculley. I hope he learnt from his mistake. Anyway I guess it will be very difficult to find someone with a vision for new products as good as he had.
But when Jobs picked Sculley, he was young and inexperienced. He probably had never worked with 'an MBA' so he didn't know what to watch for
Also, the relationship with Sculley went downside fast. When things don't match, this is usually what happens.