It's unfair to judge a program's success by the performance of their quarterbacks in the NFL. The pro game and college games are so very different that any comparison between the two is inherently unfair. The development for a QB in the NFL takes so long, and depends on so many factors, that ascribing any of the successful qualities of a 30 year old starting QB to anything that happened when they were what, twenty years old?
It's borderline asinine, really, to even consider it. So what if Alabama wins without NFL talent at quarterback? Most teams win without NFL-quality starters behind center.