Reid and McNabb's flaws where hidden when McNabb was still a running threat. It effectively neutralized a defender in the passing defense, amnd created a legit run threat even if they called a passing play.
Now McNabb can't/won't run, they are being exposed. the defense gets to load up on the pass becasue of the unbalanced play calling and lack of run blocking. And McNabb's weaknesses as a passer/decision maker are exposed because he now has to go up against defenses geared for the pass, and without the crutch of having a spy that could otherwise be in coverage or pass rush.
The McNabb/Reid combo was a successful one for many years, and I give them credit. But I doubt either survives the current downturn. The team needs to get a better passer to succeed in Reid's system, and I doubt Reid will get to rebuild the team. his only shot is if Kolb can quickly show himself to be a star.