I don't mind changes being made once a TREND has been spotted, but a bad game, or even a couple of bad games does not a trend make. You could say that we've officially seen a trend after these last three games, and I wouldn't necessarily disagree. But if most fans had their way they would fire the entire coaching staff, change schemes and bench half the starters on the spot after a bad first half (You wonder if they sell their entire retirement plan after one day of negative trading). So I don't mind Parcells being more prudent than what fans would like on the matter, but that doesn't make him inflexible. I don't see Lovie Smith changing to the 3-4 because his defense has allowed 27, 31 and 21 points in the last three games (to much worse offenses than the Saints and the Eagles). I believe most can agree the Chargers have one of the better defenses in the NFL, but they had a five game stretch where their defense gave up 30, 24, 25, 41 and 27 points in five consecutive games. Yet, somehow, Shotty didn't scrap his entire system. Believe or not, most coaches don't scrap their system midway into the season. Its not just a Parcells being stubborn thing, although that seems to be a HUGELY popular theory among Cowboy fans that seems to be attributed to all kinds of kooky, half baked blame assesments.
I'm just more reserved and skeptical about what impact a change in scheme would make. I believe the 4-3 is some sort of nostalgic, security blanket for Cowboy fans since that's what they're accustomed to. Now its been attributed with mystical and magical properties capable of providing an instant panacea to all our problems. If the 4-3 system was inherently so great at providing a pass rush, how come our pass rush sucked so bad in it from 1996-2003? And how come it still sucks today when we go with 4 down linemen in the nickel?