Once house of wolves drops have each vendor randomly rotate their stock from a pool of weapons and armor that includes the gear from the base game and both expansions.
That way new players can try out old weapons and old armor styles and we can get back some of our favorite gear that we dismantled because we ran out of room or didn't want lower level gear.
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I really like this idea. Still, I would much prefer that we be able to just flip between pages based what generation of weapons we want to see.