Here is my take:
OLine with 3 players who have started less than a seasons worth of games
No surprise Moore struggled as well, he was dealing with rookie WRs and an OLine that average 2 seasons in the NFL.
No surprised Clausen has struggled more, as he has not had 3 seasons and 3 training camps like Moore has.
Unfortunately the way the season has gone, Clausen has taken most of the flak and most of the criticism, when in actuality none of the QBs on our roster had the experience to thrive in this situation. Moore is proof that this season has brought the worst out of our QB play, so it's not unlikely that Clausen could have progressed from this season.
The biggest mistake Fox and co was bench Moore early. Sit him for his concussion, sure, but do not bench him because of two poor games. Yanking both QBs at times this season completely loses the QBs ability to be 'the leader' as it shows the coaching staff does not have faith in your abilities, which I turn makes it hard for the team as a whole to buy into you.
Clausen is not THE reason. He is part of a big reason, which is a poorly constructed offense in virtually every facet. Play calling, skill, experience. None of it is there. Our coaching staff had made sure that it was almost impossible for the QBs on or roster, believe it or not there are plays that can be called which will negate lack of experience.
If I were Fox, I would sit Jimmy down and say, "Look, forget about making mistakes in the games, forget about next season and forget about what has happened prior. Just go out and try to win a football game." I personally think the 'shackles need to be taken off and he needs to realise that sometimes a QB will makes mistakes, especially as a rookie. However we need to see him go out and have fun and try some things. Up till now he has been playing in fear of being smashed by the opposition and buried in the gridiron of BOA, being concussed, and/or otherwise injured due to a vanilla O-line.
Oh and there is no need to ship him out this off-season. Let him sit or enter next camp as starter, get some pre-season in him and see if he can raise his draft stock. The guy is cheap and can easily sit in third on the depth chart. At the end of the day he was supposed to have potential, why give up on him when there is no need to? The guy is cheap as chips and under contract for four years. If he can get 2-3 quality pre-seasons under his belt then there will be teams calling.
Fixed! Now I can agree with your take