I too believe the problems are "fixable", but there isn't much time. After this Oakland game on Thanksgiving, we go into a brutal December. If problems do not get resolved on the offensive side in that game, things could spiral out of control.
Call me a pessimist, but if this team is scoring less than 20 points per game going into December and they start to lose some close games, all the pundits will again begin talking about the December collapse.
One thing that I know about this team is that they don't seem to be mentally strong. They seem to have a fragile psyche. I just have a bad feeling that if they start to drop games and can't score in December, they're going to start thinking "here we go again".
The bright spot, as you said, is the defense. I'd like to see more takeaways too, but IMHO this is a championship caliber defense. If this offense can just get back to its aggressive, big-play personality they might be playing in that game. If not, they might not even make the playoffs.