Destiny 2 Two: Electric boogaloo

I agree, but that's basically what's happening now with the Portal and gear tiers. All the old content is still in the game, but only a fraction gives any tiered loot. People won't play content that isn't rewarding, and non-tiered loot feels unrewarding, so you have no incentive to play old stuff.

Whatever happened to Riven's eggs? Plotlines for the future mayhaps

Cori agrees (except I don't know physics)