Totally disagree. I think people figured Keenum out, that his success was mostly through deep passes and when he was able to scramble. When teams started to come after him, he folded. It's not difficult to stop a quarterback when they can't handle the blitz and the offensive line isn't exactly stellar.
I think it's a combination of both. Yes he struggled picking up the blitz, but i will give it to him based on his lack of experience. It was a tough situation to go from running the scout team to taking real, meaningful NFL snaps on a team that was so far gone. I do also agree that Kubiak lacked the ability to adjust his system to his players. That is what makes a great coach.
The real sniff test will come this season as we see how far Keenum has come from last season and what he's picked up from his playing time. If he jumps as much as he did from year 1 to year 2 we will be in good shape and i am optimistic about his future as our QB. If comes out and is still making the same mistakes then we have a problem.
Either way, I am very excited that OB is running the show now. I think Both Keenum and Yates will grow as QBs under him. We might not be as in bad of shape that we all think we are.