Here is an article about the new US stance towards Cube from the St. Kitts & Nevis Democrat:
"The real impact on Caribbean tourism will come when the US and Cuba normalize relations and the 49-year old US embargo on Cuba comes to an end but, the worry that Obama's decision has created in some Caribbean countries is a good thing. None of them should predicate the development of their tourist industry on a continuing trade blockade of Cuba by the US."
Emphasis mine - and I definitely agree. Cuba is close to the US, will probably remain inexpensive (although I am sure the high end will have a spot too), and will most likely have a "taboo" effect that will make it impossible for American tourists to resist.