I think the O line will be fine remember its just the 1st game and a lot of these guys didn't play many snaps in the preseason there is still a lot of rust to be worked off. They will polish up nicely.
I wouldn't blame much of the offense struggles purely on the offense or Trestman alone, Look at the whole picture when considering we were playing a Rex Ryan team that prides itself on using elaborate blitz packages and making teams 1 dimensional by stopping the run. If anything I think our guys did one hell of a job getting the yards when they were there.
Also consider that Joe as shaky as many thought he looked actually did one thing very positive he protected the ball, Joe had no INTS and no fumbles. Just that miscue of the timing of the snap that was fumbled but that wont happen all the time so that can be tossed. Joe really did show under great pressure from a blitz happy defense that he was there to compete and made sure he protected the ball. That goes along way for this offense!