I think the biggest change in the college/NFL equation is that while both have gotten more complex, the collegiate and even high school games have gotten dramatically more sophisticated. With the internet, film study is a given at every level, and the camps can start with far more intricate stuff. By the time collegiate prospects reach their junior year in high school, most have poured over a lot of instructional videos on route concepts, blocking schemes, throwing technique, footwork, offensive systems, route progressions, etc., etc., etc.
The kids going into college are so dramatically more prepared than they were in the past it's like night and day. So, these collegiate coaches are able to run far more sophisticated offensive systems, which prepares QB's far better for the NFL than in the past.
We're in the information age, and the QB position is tasked with a remarkable amount of information mastery and processing, so nothing helps more than access to the internet for all types of information learning.