I think if he slips much it will be more due to teams desperately grabbing quarterbacks than because of his knee (which allowed him to run for 150+ yards and 2 TDs in his first game back from a minor knee surgery).
Roto is also reporting that QB Colin Kaepernick may go in the first round; this speculation alone is likely to increase the "must draft QB early" mentality that's emerging. Maybe teams should ask that Belichick guy what kind of talent you can find in the sixth round ...
By a huge margin, offensive tackles have performed best out of first round picks, with running backs a distant but respectable second. QBs and WRs are next to last in Pro Bowl appearances, behind only Defensive Ends (the worst performers from Round 1 picks).
As for Lombardi, he made most of the knucklehead personnel moves that got Belichick run out of Cleveland. Yeah, he's the guy I'm taking my scouting advice from