I've a suspicion some how between D2 and D3 the Young-Wolf is going to die and our character for D3 will be some one new even if where a returning player.
To qoute the Doctor from Doctor Who "every thing has an end, it's natural, it's sad but it can also be beautiful."
The Paradox theory could play into how our current Lightbearer could die.
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They could just try to keep Destiny 2 alive but they need to make it more like Diablo 3 which has a lot of replayability even to this day. Where missing a horde mode that keeps you moving and uses procedurally generated maps.