Tbh, "monkeyball" type QB's probably weren't instructed properly in the lower levels of football as coaches simply used their athletic talents to win games against lesser compe ion.... by the time they get to the NFL, there's just not enough time to re-learn the most important position on the fly before all the other teams get tape on them and fans', owners', and coaches' patience runs out, tbh..... and this applies just as much to white quarterbacks like Tebow and Kaepernick as it does to the Vicks and Newtons of the world, tbh....
I do think that we will eventually start to see more "dual-threat" quarterbacks winning Super Bowls though, tbh.... since that's the only type of QB that colleges seem to produce anymore, eventually there'll be a time when pretty much every team has one, and then one has to win it all....