The Antman movie is content. With Destiny 1, you can still play all Quests, Strikes, Crucible Maps, Raids and Patrols that you purchased with the original game (plus any expansions you may have acquired). These things are content; you purchased this content, and can still access it whenever you wish. The Nightfall and Heroic Story/Strikes? These are [i]features[/i]. Features are different from content. They exist to promote and utilise the latest endgame, whatever that happens to be. In your 'bluray' analogy, it would be akin to clicking on your library, and it says "watch the latest Antman movie". You can't access this, because you don't have Antman 2. But you can still watch Antman 1 whenever you want; that content is still there, you paid for it, and no one has touched it.