Are all of those bands you mentioned indie? Is Iron & Wine indie or is it more folk? Is Nico really the Nickelback of her genre? By association, would the the Velvet Underground also be considered a sort of Nickleback?
What exactly is Indie music, if not independently produced and created music? I would call The Killers Nickleback before I would call The Arcade Fire a "Nickleback" of a genre that could encompass several genres within itself. And I think that Nickleback isn't only the Nickleback of its genre,it's the nickleback of a **** genre to begin with. Of a genre that we've been through before (not necessarily a bad thing) but with less meaning this time around.
I'm not saying you're not entitled to your own opinion or taste in music, I just disagree that many of the bands you mentioned are bastageizations of their genre.