Ryan to San Francisco would be a disaster for them.
Balke will pick a guy that he can control, or thinks he likes and it wont work well.
Fangio is a defensive coordinator and not a head coach IMO. I think he will be in over his head. The best coaches have a good grasp of both sides of the ball. From the one report that the owner really didn't like the bad PR from having his players in the paper and feeling that Harbaugh was not as concerned as he should be, maybe he and Balke go with a disciplinarian type of coach.
Whomever they choose, I think they will find it is not easy to replace a good coach.