OK, you only took total yds in Stats, but there are more facts in defense like Int (Chicago is 2nd in the league), Sacks, fumbles... but thats not my point.
I totally agree that a team with a good QB has more chances to make the playoffs and a SB, but my point is that you can´t do it only with QB if the rest of the team sucks. why?? First of all a football team can't be based on one player, what happen if he has an injury?? then your season is over?? NE lost his great QB and they're still winning some games, they have good coaching and even if they're not the best team in defense, rushing offense or special teams they have consistency in all their lines.
Then, even that good QB have mistakes, Manning, Rivers and Brees had a bad day last Sunday, so you need to have a good team in other areas to help you in that times. Indy has it and they won, SD and NO don't and they were beaten.
-------------------------------------------------
But ok lets suppouse that you're right, we need a new QB for the next season an he has to be good instead of giving Trent more time to proove that he can do it.
What's the next step?? Going for a top ranked QB in the draft and give him a lot of money to sign with us (I think that's very risky, you don't know if you will get a QB like Matt Ryan or Joe Flacco or you will get a guy like Ryan Leaf or Joey Harrington). Or going for a proved NFL QB that will ask for a lot of money so we wouldn't have good new players in other areas, and... Who will be available??
What about giving Trent Edwards a better offense, maybe a good Tight End, another top receiver like Evans, a better offensive line (I don't know where to find stats about that, but you can give an idea by the time their QB has to throw the ball). I really think that Trent would be a good QB for the Bills.
-------------------------------------------------
And speaking about Kurt Warner, don´t misunderstand me, I really admire him, without him Cardinals won't have that record, the only thing I said was that he could throw for 300 yds score 40 points, and maybe that will not be a clear win for Arizona because they don't have defense.