QBs aren't easy to find but teams can succeed with a mediocre QB. Joe Namath, Mark Rypien, Trent Dilfer, Matt Hasselbeck, Rex Grossman, Jake Delhomme, Brad Johnson, Chris Chandler, Neil O'Donnell, Stan Humphries, are just a few QBs that made it to the SB.
Like you said, QBs are hard to find, so you gotta find alternate ways to win. Just because you don't have a QB, you're going to give up every year until we get one?
Teams can be successful with a mediocre QB. Hell, the Jets made it to the AFC championship game in back to back season with Mark Sanchez as their QB. It can be done.