Romo as you stated could be a problem if he doesn't improve his passing from inside the pocket.
Campbell could very well have a sophomore slump
McNabb has injury concerns, and they lost Stallworth who was a big part of their offense when healthy
Eli has no Tiki, an aging Toomer and Diehl at LT, so his accuracy issues can resurface like it did in the 2nd half of this past year.
So who knows what will happen. I really have no idea myself. I think all 4 teams have solid qbs and all 4 have potential of having franchise qbs for the future, but to rank them right now is very difficult. Too much going on around them for us to do a straight up evaluation of that nature.