Well Atlanta will still be at home, the 49ers will be traveling almost as far as Seattle did (not sure if they have the late or early game), albeit not 2 weeks in a row. Seattle just destroyed SF less than a month ago...what you mentioned doesn't make up a huge 8.5 point gap between last weeks line and this weeks in my mind. I think it has more to do with SF a) being a more national team with more bettors, and b) beating GB, another national team, soundly the previous week. Still seems like an high line though overall.