Expansion? So you get to use all of the legendary stuff collected, and it keeps its relevance for new missions/strikes/raids? That would be cool for expansion (to expand, instead of replace). I haven't heard enough about this, though. I like Bungie's take on the fact that we grow with our gear, keeping it for years, evolving at our own pace, and upgrading stuff to keep it new and fresh, while swapping out old stuff for new as we see fit.