I forget who mentioned this a few weeks ago so I can't give credit, but someone made a good point about changing QBs. The Eagles are out of the race anyway this year, right. If you bench McFlabb, how much trade value will he have?
If they let him play out the year, they can always claim the problems were not his fault and blame the rest of the team. Then they can entertain trade offers. If they bench him now, his trade value declines because the team is in effect admitting that he's lost it.
Of course that's presupposing that he has any trade value left anyway. I'm sure he does, but it won't be very much. I wouldn't trade for him unless I had absolute garbage at QB.
To answer the question posed in this thread, I think he will start if he can, but he will wimp out as soon as the Pats start to pull away.