You already proved this point by putting together just a small list of failed short QBs. That list shows exactly what we are talking about. Probably over 90% of the QBs in the league right now are at least 6'1" or 6'2" and that percentage is even greater the further in the past you go. I think where guys that could be talented QBs tend to lose their chance is more so in college or even highschool where they are pushed into playing other positions due to their lack of size. Wilson not being drafted higher is also somewhat proving the point because he absolutely goes in the 1st if he were a few inches taller. Shorter QBs just simply get less chances in the NFL and that is because for the longest time a large part of the league believed that QBs had to be the prototypical 6'5" guy with a strong arm and guys have come along quite a few times and proven that to be false.