this is a partial response to raven and also some quick research i did regarding Bill Parcells' teams. parcells is one of the best coaches ever and is known for his discipline more than anything, but even his teams showed lapses at times.
I'm not crowning Harbaugh the master disciplinarian but merely making the point that sometimes your players won't be disciplined no matter how hard you teach it.
the 2005 cowboys had 5 games where they turned the ball over 3 or more times, and they went 2-4 in their last six games to miss the playoffs by one game.
We'll leave 2004 out of it since that 6-10 season began with Quincy Carter being terminated from the team for drug abuse.
Parcells went 34-32 in Dallas and won zero playoff games.
In his first two seasons as a head coach in New York, he finished 3-12-1 and then 9-7. That's a grand total of 12-21-1 in his first two seasons. Harbaugh will be at least 19-13, or at best 20-12.
Again, not making any predictions that Harbaugh will rise to greatness as Parcells did. Just pointing out that sometimes years go bad, sometimes players don't practice the discipline they're taught, and sometimes you just need to wait it out with a coach and see what he can do. What if the Giants had fired Parcells after his first year (which they considered)?