Flynn's fine, in the first place - if it had been a reg. season game he would have been in uniform and second on the DC. So we're not looking at going into the Bears game without our number 2 QB.
QBs 1 and 2, we're fine. Brohm's still learning - also fine, because we don't need him to be good at this point. He's in these pre-season games because live bullets are the best teachers, not because they necessarily expect him to succeed. A number 3 QB had almost better NOT be good - if he is, you better trade that mofo for another player you actually need. If, God forbid, we get to a point in the season where we actually need our #3 QB to step in and win a game or multiple games for us - well, that'd never happen because we'd either a) already have picked up a veteran FA, if we'd lost either 1 or 2 in a game, or 2) hopelessly fucked if we somehow lost both in one game. In other words, it's safe to say that Brohm won't see a snap in the regular season.
I do agree that he hasn't looked good - I'm not making light of your concerns or anything, just pointing out that his play isn't a concern for the regular season. He'll get this next game to learn things the hard way, and then he'll get another season and off-season to watch, learn, and try to absorb enough to prepare him to play at pro speed. If he looks this bad next year, he's probably going to have to look somewhere else to play. Or the light could turn on and we'll see what Louisville fans saw - then we can trade him for something good or feel better about having him behind Rogers if needed.
To play along and answer your question, though, I think Thigpen could be an interesting guy to put behind Rodgers - he's raw and he needs development, but he's a hella good athlete and has shown an ability to run a spread-type offense at the pro level. You could conceivably pare down the playbook in a pinch and he could keep the team afloat, and meanwhile you could groom him to improve the other aspects of the game - then, if we're lucky and Rodgers is still on his game, you have a Hass scenario where you can trade him to someone else for something you need, or if we need him he'd be ready. McCarthy's convinced me that he knows QBs, and with Thigpen's athletic skill set, he could be a beast.