Just saw this article talking about the rise of "Don't Stop Believing" by Journey back into American conciousness. I don't know that you can really pinpoint when this song became what it is today. My guess is that it happened the same way Pabst Blue Ribbon became popular unexpectedly a few years ago...as a joke.
It is undeniable that this song is everywhere...also this song. I can't wait until they really try to make grunge songs into sports anthems next decade.