Which has proved to be a big mistake in most cases. In college a lot of these guys are primarily asked to run the ball & also make pretty easy downfield passes. They almost always only rely on finding the primary or secondary receiver. This is obtainable in college since the level of talent & speed doesn't even come close to that of NFL defenses.
I think this just means that NFL FOs will have to work harder to find a QB that will work well in the NFL. It is not as if they need to find that many QBs. There are only 32 teams - you would think that over a multiyear period they could find a handful that could get the job done.
All I can say to that SoCal is, at one point our team fielded 16 different starting QB's over a 16 year period and still we hunt for one that can get the job done. (For me that includes Kirk)