I think part of the problem is though that post millennium you didnt really have as firm "cultural movements", with the rise of the net culture tended to facture more and you'd have certain kinds of music, fashion, etc exist in their own bubbles for longer rather than really massive shifts every few years. So maybe indiivdual things might have nostalgia you can't really get a more generic "00's nostalgia" the way you could for the 50's 60's, 70's, 80's, etc.