Think about it: who else is a better choice? Parcells could run the "D," stay off the sidelines if he chooses and out of the limelight, and interact with the players - something that we all know he loves doing.
Plus, he would be working with whoever he drafted...I'm feeling a heavy defensive draft here.
Let's start a campaign for Bill Parcells to be our next defensive coordinator! Who knows?! If we hype it up enough and get it into the media, he may even put a bit of thought into it...and that's all it takes to get the snowball moving down the mountain.