Reconfiguring D1 material for D2's engine would be difficult. Otherwise, they'd have done it already.
I suggest adding a horde mode to the Forest, like a sim Prison of Elders. Have it deliver Hive, Vex, whatever. In a randomly determined platform arena. Have Osiris and Sagira take Variks's place (or bring back Variks).
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I actually thought of an idea. Three paths. First path goes to the past where the horde mode is. The second path goes to the future where puzzles are. The third path goes to an infinite path that generates and at the end there is a boss which drops loot depending on the boss tier and you can go back to the present whenever you defeat a boss if you want. At the three "trees" Osiris would be there with am inventory.
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I... I like this idea. It utilizes existing game algorithms, offers new ideas, and makes the evanescent Osiris a little more present in the game. Bungie would do well to pay attention to this post.
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You've probably seen Datto's video where he talked about how the mission "Bug in the System" could easily become a horde mode game. It's a great idea. Will it ever be implemented? Probably not. Even if it was, it would be here for a week and then not come back for another half a year like Sparrow Racing.
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Need to replay that mission.
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Unfortunately it might be the closest we get to a survival/horde mode. It's a really fun mission at least.