DD has to develop a reasonable 3-point shot and mid-range game just to keep defenders honest. He doesn't need to be like Dell Curry, but he needs to be respectable in this area. Once he develops a 3-point shot, he will be a much more dangerous offensive player.
Besides Jordan, Bryant, Wade, James, Rose, etc. all had to develop their long-range games and they became even more lethal offensive players. Not to say DD can be like them, but he can be a consistent player that scores between 18 to 22 ppg.