If you jettison your "QBOTF" every year just because the "next big thing" comes out of college, you'll be spinning your wheels forever.
Sincerely,
Josh Freeman
Jamarcus Russell
Matt Leinart
David Carr
Tom Couch
Akili Smith
Ryan Leaf
Heath Shuler
I'm a big Rosen fan, so I can't believe I'm sitting here arguing the concept of taking Kyler Murray (or Haskins), but only half of your list was the #1 overall pick. Not only that, but none of the players on the list were taken by teams "jettisoning" a QBOTF, they all needed someone.
Freeman - Replacing a 38 year old Jeff Garcia
Russell - Replacing Andrew Walter/Aaron Brooks who were clearly not answers
Leinart - "Replacing" a 34 year old Kurt Warner.
Carr - Replaced no one.
"Tom" Tim Couch - Replacing no one again.
Akili Smith - Replacing Neil O'Donnell... 'nuff said
Ryan Leaf - Replacing Craig Whelihan, and Stan Humphries, neither of who were the future
Heath Shuler - Replacing a 31 year old Rypien and 28 year old Rich Gannon
...Point is, these teams weren't giving up on guys they'd invested anything in at all, really.