Time travel has become the bane of television SF, ruining perfectly good shows left and right. It's OK to do a show that's about time travel (Doctor Who, Time Tunnel etc.) but usually when a "regular" show throws in some time travel it ruins all consistency. Babylon 5 did OK, I guess, but even there it takes away from it. Heroes is also starting to wallow.

And based on what he has said, Ron Moore thinks the same way, and does not plan to use time travel in BSG. Though he does strongly feature a "cycle" theme we have yet to see why.