After the embargo will end and Cuba will have a transition from a socialist country to a capitalist country,the mob could return on the island ?

For sure the new authorities will work hard on tourism, especially from the US. I don't mean that the casinos will return as in the Batista era but certainly the Cuban laws are not similar to the US or Italian laws and there will be much more corruption between police and politicians.

The Lansky family is trying to re-have the hotels and who knows.