Well, we've got at least 1 more year of Fitz as the starter. No argument with any of your points, but I do expect Fitz to get better, I just don't think he has that much headroom for improvement. Since we didn't draft a QB, N&G will bring in a FAQB who most likely wouldn't be starting on any other NFL team, either.
So we hope Fitz exceeds expectations and the D picks up a LOT of slack. Or we pray for Luck.