You have to look at two things when it comes to drafting QB's, and seeing where they land. First is grade, and how high he would grade out in comparison to other QB's in the draft. With that, he would do alright I would assume. He has good size, decent mobility, a good (not great) arm, and a nice football IQ. I would say he is top 10 among QB's in that aspect.
Only two QB's, as of now, grade as first round picks (Geno Smith and Matt Barkley). Add in the other senior prospects who grade out as draftable (Mike Glennon 1st or 2nd round; Tyler Wilson, EJ Manuel, and Landry Jones 2nd or 3rd; Aaron Murray, Ryan Nassib, and Zac Dysert 4th or later), plus the junior currently ranked ahead of him (Logan Thomas, Tyler Bray, Derek Carr, and Bryn Renner courtesy of ESPN), and you see he would probably fall into that 8-13 range as a drafted QB. Which would fall somewhere in the 4th-7th round.
Second is need... That's whereit gets hairy, because not many teams are QB shopping this year, and there will be a trickle down effect because of it. He has little upside in leaving...