Past Tense?
last I heard, it was still up there.
Anyway, does the Smithsonian have that sort of budget?
If you try insisting that NASA has an obligation to bring the bits back and put them on show when they're done with, it'll be the same mess that the oil industry is in when environmentalists insist we remove all the steel jackets (that, BTW, fish, algae, seaweed and corals are having a great time with) and restore everything to pristine conditions. That;s one of the reasons why oil is edging towards US$50 per barrel)