I do not like The Killers nor the majority of the emo bands.
But I think that what Brandon Flowers said is relevant. He is thinking and questionning about the futur of music. A lot of teenagers who are for certain future musicians listen to this kind of music and will be influenced by it.
Is it a good thing? I don't know! Even if I don't like emo, I think that each artistic movement has a reason to exist. It's often a kind of revolt against the previous movement. Perhaps the futur of music will be a kind of revolt against emo. Perhaps music of the futur is going to be emo-influenced. I don't see what's wrong with this even if I don't like emo.
C'est la vie!