There is 0 reason to drop ps3 and 360 at this moment. No expansion ever could bring enough changes to the game engine or ui to warrant dropping a console generation the game was built for. Destiny 2 will drop last gen, an expansion should not. We will be using the same disc for -blam!- sake, I preordered the most expensive ttk edition, the disc it came with is still in its metal case, never been opened.