When does the campaign end anyway? I'm on the Tiny galaxy map where you have to retake that planet from the Dread Lords. I just got done with that Gigantic galaxy where you have to protect Earth and send those transports 8 honking sectors south to that lone planet.
I have to admit, though, I don't particularly mind if I spend this campaign running away--IF, in an expansion, we get to do as you say and finally beat them down with a stick later.