I'm honestly surprised the debate over Trestman is so one-sided. Usually there's a contingency of fans defending the coach.
I mean, looking at the offense as a whole, I still can't put all of the blame on Trestman. The OL came into this game missing Stanley, and with Wagner going out in the 2nd half, it became even more jumbled. Protection wasn't great between this game and last, and without great protection, it's harder to throw it deep, since deeper plays take time to develop. Plus, it seems like no one on this team other than Steve Smith can get separation, and no one except Steve and Pitta can make a tough catch in traffic. Perriman has had at least 1 drop per game, Wallace short-arms/body-catches everything, Moore has drop problems, and Aiken can't get separation to make a clean catch. Plus our run game was weak to start the season because Zuttah and Forsett were struggling, putting even more burden on Joe at the time, though the run game has improved since then.
So, I think you have to put some of the blame on the players for not executing. Anyone who wants to scapegoat Trestman for everything that is going wrong is being irrational.
Having said all of that, I recognize that Trestman is definitely at fault for some amount of what has gone wrong. Abandoning the run is inexcusable, especially when the game is close, running is effective, and it would help mitigate the problems with pass-protection. The dink and dunks are far too frequent, though I wonder if this is more a factor of people not getting open downfield coupled with pressure (would need to watch all-22). Any penalty on offense kills the drive because we cannot possibly pick up penalty yardage + first down yardage with our dink-and-dunk style, and it seems our offense generates a lot of holding penalties, at least the past few games.
I'm hoping Harbaugh and the players can have a discussion and work themselves through their problems without firing Trestman--that's probably what they'll do and then re-assess near the BYE. It's unrealistic to expect Trestman to be fired this early imo.
I have no problem with dink and dunk either--that's what offenses like the Patriots and Andy Reid do. However, they also use the run effectively and take a deep shot down-field every now and then for big gains. Trestman seems to be too reliant on dump-offs and screen passes.