How many games have Russell Wilson and Kaepernick missed? A combined zero? I suppose it helps that they had coaches who actually knew how to use them. You don't just run them into the ground. you run them enouh to let the defense know they have to defend it.
That's all not to mention the NFL lacks innovation. They are a copycat league with a few exceptions. If teams want to sit around and wait for a guy like Rodgers or Manning to appear, they can have at it and in the meantime try to squeeze Andy Dalton into your system just to make the playoffs. Meanwhile, I'm going to draft a guy in the 2nd or 3rd round, use his strengths and be better than you because I don't refuse to use a QBs legs because that's not Footbawl.
The NFL isn't short on QBs any more than it ever has been. You have the tiers of guys just like we always have. There is the establishment, however that wants to make an excuse for their ****** QB play, that colleges aren't producing them. They are, they just look different.
And for the love of football, "spread offense" doesn't mean running QB.
You can do this in any offensive system. The point is running QB's are much more likely to get injured, so you draft a guy who can run an offense and who may have the ability to run to keep defenses honest. If you do it right, the QB doesn't need to run and many teams have had a lot of success with that. It isn't that the NFL isn't innovative as you suggest, they just understand their investment. It's just stupid to think teams won't innovate when there are millions of dollars on the line to be had.