Analysts have been saying that ever since I started watching the NFL in 1979. "Mobile QBs are the future of this league!" And yet, here we are, twenty-six years later, and the league is still dominated by pocket-passers, and the two best are named Manning and Brady. McNabb and Culpepper have mobility, but they are pocket-passers first, and didn't become good QBs until they learned to stay in the pocket.
Don't get me wrong...mobility is an excellent secondary skill for a QB to have, but when mobility is a QB's primary asset, then you could find yourself with nothing before all is said and done.