It cost Chelsea £18mil to sack the Special One : to get him back will cost £10mil in compo to Real Madrid to break his 3yr contract with them : if he quits Real, he'll have to pay them £10mil from his own pocket. If Real fire him, he gets £10mil and Chelsea can then get him for free.
Now, Abramovitch is filthy rich, but I'd reckon even he would baulk at paying out a total of £28mil to get rid of, then get back, an employee who cant seem to stay at any club longer than a few years before he doesnt feel the love sufficiently to warrant the effort of actually fuflfilling his contract.
Mourinho is an excellent coach, but for a long-term relationship, Abramovitch is better off getting a dog.