it does depend to some degree on goals but right now we're not guaranteed to go 5-7 or better with O'Connor and we're not guaranteed to win more games with him than other players. But if we stick with him, we are guaranteed to be starting over again next year with another inexperienced QB - and we could be doing it coming off of a 5-7 season. Personally, I think we can probably win as many games with someone else as we can with O'Connor.
I also take issue with the assumption that changing something that's not working necessarily hurts "the brand" - especially that it somehow hurts the brand more than the product we're putting on the field right now. Change could be what saves the brand while soldiering on in the wrong direction could do some real damage to the brand. Seriously, how is sticking with O'Connor protecting the brand? This presumption is entirely unfounded - it's an baseless assumption.
If serviceable is what we're looking for, then I think we should work to get a QB with a future up to that level, not wasting time trying to get TOC there. If there truly was no QB battle this year, then we're in real trouble going forward. Maybe there wasn't a battle because the coaches felt comfortable with TOC's 4 years of knowledge and familiarity and didn't really open it up to a real competition. I have a hard time believing what we're putting on the field is head and shoulders above our other options.
I also completely disagree that the problems are in the trenches - the problems are everywhere. Sure we don't have the sacks we want and they're not the dominant force we expected but our problems on defense, prior to all the injuries anyway, were in the secondary. The o-line is a different story - this is the first non-WAC o-line I've seen that is better at pass protection than run blocking. That's a disgrace and it's a recipe for disaster for our offense. The problems are everywhere and we should be looking at changes everywhere - the secondary has sucked long enough to be taking a look at Barnett, the play calling is bad enough that Warner and Bollman deserve a look. O'Connor's play is bad enough that his spot should be under scrutiny. The list goes on.