So, Do We Still Have To Keep Vick?

I've had a thought tumbling around my head the past couple weeks, and it goes something like this: Most every Eagles fan, even the ones who've been on the Vick bandwagon pretty much from the first time he exploded on the field this season, still aren't really in love with the idea of giving Kevin Kolb away.  Maybe he's not Mike Vick, sure, but he's shown an awful lot of ability when he's been out there.  And while he's never going to be the running threat Vick is, arm strength can be built (ask Tom Brady) and there's a decent chance he's already the best red zone QB on the team. On the other hand, what does it say when every quarterback the Eagles throw out there plays pretty much the same way?  Toss out Jeff Garcia if you want -- since he had his formative years elsewhere -- but at what point are McNabb, Vick, Feeley (the one who came back) and Kolb no longer a coincidence?  Are we really tossing away that much potential long-term value by trad...