Best Case Scenario:
When Eli Manning retires Ryan Nassib takes over plays great and leads us to a Superbowl victory, like Aaron Rodgers did after Brett Favre left. Its possible although I see Eli Manning playing at least 4 or 5 seasons with the Giants. Also what if Eli Manning has another bad season, what do the Giants do? Its something to think about. And actually Ryan Nassib would still be a young QB assuming Eli Manning stays for 4 or 5 more seasons.