I don't think we should hope for Simeone... First of all, he's still building at Atletico, so I don't know if it's realistic for us to expect him to leave, he has a contract until 2017 after all, so that's another problem.
If he does leave Atletico, don't expect only 3 clubs in the world to go after him. Suddenly you will see loads of them begging him with all kinds of offers, from huge money to project promises.
On the bright side, I think we're safe as far as the Manchester clubs are involved. It's completely against his methods and philosophy to join City, a club where the players mainly take so many things for granted - being an underdog was a huge foundation for his success at Atletico, it's who he is as a person, rough and ambitious, proving a point. I can't say it's impossible, especially after Pellegrini's questionable results this season, but still... I don't expect this to happen, really.
United, on the other hand is completely impossible. LvG is there to stay, I'm sure of it, they've given him time and rightly so. Spent so much money on players he wanted, I don't think they'd afford to rescind his contract.
As for Inter, Thohir would have to be VERY convincing as far as the project is concerned. He would have to offer Cholo some guarantees that he can do things his own way and that there is a ready machinery for everything else; get him players he likes too and complete liberty in selecting the squad and the way they play. His history with Inter plays to our advantage.
It remains highly, highly unlikely no matter what. Even if we enter the CL.
All that said, I really hope it's not Mancini in the end. The man spells mediocrity. I also wouldn't go with Mihajlovic, despite his good results this season, he simply hasn't proved enough.
Jorge Jesus from Benfica,
Frank de Boer from Ajax, Sevilla's
Unai Emery and Everton's
Roberto Martinez all are great coaches.
But most of all I would advise Thohir to get the phone in his hands and call
Marcelo Bielsa, there's a revolutionizing coach who can leave a permanent mark, one who can really teach the players things they will remember after he's gone.
Happy hunting to Thohir this next summer