After watching the SG-1 episode, Ripple Effect, I realized that the SGC will order the ZPM from Atlantis recalled back to Earth. In that episode, the mirror-universe team had to retrieve the ZPM from our universe to defend Earth after the Ori established a beachhead and invade. Now that has finally come to pass in our universe as well. Since the Ori threat is much more immediate than the Wraith, I expect the SGC will recall the ZPM. Weir and the rest of the Atlantis Expedition Team will object. But the appropriations committee will overrule them - being politicians of course. However, in the end I believe this is better for the series. Without a ZPM module, the team will have to be much more careful again. It helps to bring a sense of impending danger back to the show that was often missing in the second season.