There's a degree of truth to this mayo. For the past 3 seasons, about an 8% increase per year in teams passing from the shotgun has been observed. I think it's sitting at 54 or 56%. Since the Pats went ballistic with the spread offense adapted from Urban Meyer in 2007, how many offenses have tried to emulate that? Even Pittsburgh, who have been a historically run first term now has a competent QB who is throwing for massive yards now.
At the end of the day, I have zero problems with the shotgun and as Rob has rightfully pointed out, the issue lies at the heart of O'Brien learning on the job in play-calling. It leaves most of us scratching our heads, but if you had Brady as your quarterback, I'd hazard a thought it would be difficult not to continually fall back on him in your rookie offensive coordinator season.