This is a horrible situation for any new HCs like Harbaugh to be in. It just makes the entire off season all the more difficult and kills time needed for preparation.
Goodell recently said the fans asked for less preseason games. Of course the owners saw that as a way to make more money with an 18 game schedule but are not willing to compensate the players. Also the injury risk goes up.
I guess the lesson here is - be careful what you wish for.