I think the only two QBs selected #1 overall who went on to actually win a superbowl were John Elway and Troy Aikman. So take 2, divide it by how many QBs have been taken #1 overall, and that's about what I think Quinn's odds of winning a superbowl are.
Just for fun, let's run through it.Overall #1 QBs in the Super Bowl era:
2005 1 1 1 Alex D. Smith 49ers QB Utah
2004 1 1 1 Eli Manning Chargers QB Mississippi
2003 1 1 1 Carson Palmer Bengals QB USC
2002 1 1 1 David Carr Texans QB Fresno State
2001 1 1 1 Michael Vick Falcons QB Virginia Tech
1999 1 1 1 Tim Couch Browns QB Kentucky
1998 1 1 1 Peyton Manning Colts QB Tennessee
1993 1 1 1 Drew Bledsoe Patriots QB Washington State
1990 1 1 1 Jeff George Colts QB Illinois
1989 1 1 1 Troy Aikman Cowboys QB UCLA
1987 1 1 1 Vinny Testaverde Buccaneers QB Miami (FL)
1983 1 1 1 John Elway Colts QB Stanford
1975 1 1 1 Steve Bartkowski Falcons QB California
1971 1 1 1 Jim Plunkett Patriots QB Stanford
1970 1 1 1 Terry Bradshaw Steelers QB Louisiana Tech
That's 15. Bradshaw and Aikman won Super Bowls with the teams that drafted them. Plunkett and Elway won Super Bowls with different teams. Bartkowski, George, and Couch did not win Super Bowls. Four out of seven winning a super bowl is a much higher success rate than I would have guessed.
Everyone else is at least technically still a maybe.
Smith, Peyton Manning, Palmer, Vick, and Carr are still alive.
Testaverde, Bledsoe, and Eli are still alive for Super Bowls, but not with the team that drafted them, although it's within the spirit of the question IMO to count Eli as being drafted by the Giants.