One of the complaints about spread QBs is their lack of footwork, and one of the reasons for that -- which is also a reason that college and high schools go to it -- is that their is simply less footwork in the gun. That isn't necessarily a bad thing: maybe it'd be good for pro offenses? (Think about pick-up football: nobody lines up and takes a seven-step drop in their back yard.) So that's ambiguous. And then is there just so much more benefit by being extra multiple? In college practice time is quite limited, often more than high school. So that could be a factor too. Or, maybe, the pro guys are just whiffing, just missing the boat. I don't have an answer. I end with this: I just watched a special about Joe Montana, who at Notre Dame had been running the triple-option; Bill Walsh, who knows a thing or two about coaching quarterbacks, wasn't scared away.