They should make a Destiny spin off for iOS if anything. But as much as I would like Destiny on iPhone, it just wouldn't work. Since Activision is publishing Destiny, a spin off will be likely. They already made spin offs of Skylanders and Call of Duty, so I don't see why their newest blockbuster wouldn't have one. Although I don't know what kind of game it would be, expect some version of Destiny for mobile platforms.