Why? I dont see it being necessary to put it all on one disc if the characters are transferable. Where is the need to visit the "old" places if u have new content that is as large as this we have right now and u can take your character with u? I mean if u want to visit them and do some stuff u put destiny in it, then you want to go to jupitet or some new planets, you put destiny 2 in it. Not that much work.