I don't disagree, but franchise QBs are not easy to find. The Bills have had one in their 55 year history. Kemp was a good game manager, smart, had a great running game and very good defense. Joe Ferguson was a gamer, but franchise? So the only real franchise QB was Kelly.
You can say this about most NFL teams. Most have had one or two franchise QBs. If you count Bledsoe the Pats have had two, the Jets one and the Dolphins two.
I do believe that it should be easier today than in the past. Free agency helps, and the rookie pay scale means that you can take a shot in the first round. If your wrong it is not a financial disaster.