Alonso is likely to go nowhere, there is a route back to Mclaren for him, infact I think they would welcome him back with open arms if Dennis allowed it.
But he is very very very happy at Ferrari, he is basically the number 2 guy after Luca Di Montezemolo and the key here is, Luca LOVES alonso and will do whatever it takes to make him feel comfortable.
Ferrari is more than a team for Alonso, it's his family and the team has one single goal ''get him his 3rd title''.
It would take something pretty drastic for him to leave, hopefully Domenicali gets the boot long before Alonso calls it a day/