Keep in mind that a team can only be on primetime (SNF or MNF) five times a season and no more than that. If Eagles @ Giants is promoted then that will be the 5th primetime game for the Giants, so they won't be able to flex any more Giants games. A better matchup involved with the Giants comes in Week 16, which is Panthers @ Giants and it is currently scheduled for FOX at 1:00. The SNF game scheduled for that week is Chargers @ Bucs, and considering the ratings that the Bucs got in their last SNF game, I bet NBC will want to flex Chargers @ Bucs out. I also doubt that FOX protected Panthers @ Giants, and they well could've protected Eagles @ Giants instead.