You can't really trust RDM not to lie in interviews, because he has before (or close enough to it). So, when he or others claim "we won't see another Earth", don't believe it.
It's possible that nobody will call our Earth by its name /on the screen/ too, but we might be given clues that it is indeed the real world Earth.
Here's a funky thought. What if not all of the clues to Earth's location in the show were pointing towards Cylon Earth? What if the tomb of Athena and the holographic representation of Earth and the stone circle were related to the /real/ Earth? What if Cavil sussed out some clue from Colonial mythology pointed towards the real Earth, since he would already know - via the Final Five - about Cylon Earth?