Some of you guys are making pretty good points for why Taylor should remain qb but there is one thing I want to say. Brion is not Cody Green. Brion has seen greater athletes in high school than what he'll see in the big ten. I don't buy into the whole confidence argument, because wouldn't throwing 3 picks and getting sacked all night long be a confidence killer?
At some point if Taylor continues to mess up (and we know he will), Brion has to get a shot. We've already seen the ceiling of Taylor, he will not change his mechanics, he continues to stare down receivers, panic in the pocket, fumble, predetermines his receivers, and throws across his body. There are Senior's in high school who have this stuff down.
First off, you might have a point about the athletes, but the sophistication and skill level of B1G players is vastly greater than any high school team. Seeing good athletes in high school doesn't mean you're ready for division one football. Green played in the second toughest conference in Texas, after all, and he struggled for various reasons.
Second of all, what do you mean if Taylor keeps struggling then Brion deserves a shot? If Martinez is being asked to throw 20+ times a game, that's on the coaches and not on Martinez. If players around Martinez aren't helping him to play well, that's on them as well. Now, if Martinez is fumbling all the time, throwing multiple interceptions on only 10-15 attempts consistently and just doing a genuinely poor job of executing the offense, then perhaps Brion will deserve a shot.
However, if the coaches put Martinez in a position to play well, then Brion can continue to sit back and take the mental reps he desperately needs. I've said it in other threads before - if we run the ball at least 75% of the time, and pass efficiently, Martinez can win us football games. That means we need to do play action, pass on long third downs or if we need a quick change of pace (i.e. maybe a WR screen or something like that). Asking Martinez to pass like he was asked last night is going to result in us seeing similar point totals at the end of the game.