I don't think he will ever change his shot. It is what it is. (as far as technique) He tried to change it a couple of years ago -- and shot terribly.
Interesting stat about Ball -- through 22 games last year at UCLA -- he made 2 shots that were not either a dunk/layup or a 3-pointer. The lack of a mid-range game in today's pick-and-roll NBA I think is a major concern. (note that even guys like Curry & IT shoot quite a few 2 point jumpers ... others like Irving/Wall/Paul ... that is their bread & butter off the pick & roll) With Ball's shooting mechanics, it isn't obvious that he can easily develop this range.
Agree and that's kind of what I was getting at re: his shooting motion. You just stated it a lot better than I did. He can get away with that shooting motion from 3 point range...not so much in the 10-15 foot jumper range where there are generally more defenders around.