Not saying it will happen, but no way they should be +1500 considering they are very likely to go into the playoffs with a bye. Packers are the anointed ones, but nothing is guaranteed and it will take a great defense to beat them, Bears were fairly close to doing it last year. I don't see a powerhouse coming out of the AFC to meet them if they get there.
This reminds me of last year when I saw the Mavericks(they had 2nd best record in West at the time) at +1200 to win the western conference while everyone was just assuming the Lakers would win it.