RE: El PresidenteThe question is a good one.
Answer: depends
Will post Castro Cuba continue its present political ideology which will be enough for the embargo to continue? The embargo sort of helps S because they don't have to compete with Anerican companies and all the others who choose not to do business in Cuba for fear of black listing. Maybe a more open Cuba would get in the way on Sherrit's somewhat 'monopolistic' operations as more players enter the fold.
I assume agreements with the Cuban gov't would remain the same, but could Sherrit lose its rights to mining and oil with a regime change?
I'd say Sherrit probably has had a great deal of success with their 'communist' Cuba operations, so if it ain't broken, fixing it might ruin a good thing. But then again the joint ventures they are in with the government may have a chance of becoming more Sherrit controlled in a country with less government grip.
Alot of IFs
I can't see Cuba's government control of resources going away. It is fashionably to nationalize or heavily tax foreign companies in Latin America these days, so I can't see Cuba of all nations doing an about face--Castro or no Castro.
In the end, I think it may not make much of a difference for Sherrit, but you never know. But I imagine Sherrit has been preparing for this day for a long time and that they have some idea what might happen.