Keep onslaught and pantheon in the game, add materials you farm from each for making craftable versions of exotics in the collection that aren't currently craftable. Make onslaught drop the material for non raid exotics and pantheon for raid exotics. It's a win win for the game and the community has more to do and farm. It gives us more options how to spend our time in the game and let's us keep what are two fun and interesting new parts of the game.