It maybe true that you don't need a "franchise QB" to win a SB but you do need a franchise QB to have a winning franchise. Winning the SB can be an aberation for a QB such as the case with Dilfer and a few others.. and almost every time these teams had defenses on steroids.
Quite frankly, we got tired of watching Kennel, Graham, and Dave Brown (with his behind the back no look passes to the wrong ream)... We NEEDED a shot in the arm offensively.. and the QB position was our weakest point.
No one uttered the name Rivers during the 2004 draft.. all we heard was Robert Gallery, Rothlisberger, and Manning... And in 2005, there was no telling we were going to get Marriman... and that Kicker SD got choked som many times.
With Eli, we've had far more excitement on offense than we ever did. The Giants ARE capable of scoring.. when was the last time we had that attitide pre-manning? If we don't win Superbowls it's not because of our QB not playing well.. because he is playing very well... it's because our Defense couldn't stop anyone.
In essence the "How many years do you give a QB?" question can not be substantiated... it should be "How many years do you give a team?"