I can understand Sanchez. He is stuck in a shit situation, wasting a valuable year of his career, which might have just 3-4 good years left. On the other hand, he signed a contract here and has no one to blame for that but himself.
I think we should have sold him and Ozil. That way, we would have at least gotten some money in return. We won't finish in the top four this year, with or without the two, so it really doesn't make any sense not selling the two of them.