Yes, questionable is a relative term. How many teams have their answer at QB? Sure, some teams have their answers, but I'd wager the majority do not. Are Bridgewater, Carr and Bortles really the answers for their teams? Or do they need more time to answer that? Are Winston and Mariotta the answers? Or do they still have questions? Is Manning declining in Denver? Rothleisberger in Pittsburgh? What happens to Wilson when the team around him starts declining? How good is Kapernick really? How long can Carson Palmer hold out? Jay Cutler was benched in Chicago. Every QB in the NFC South had losing records. Eli Manning too. So how good can they be?
IMO, teams not named Packers or Patriots have some sort of questions about their QB. Yet, some of them have won superbowls. And some will win superbowls. It takes more than a QB to win.