For the first time in 54 years Cuba and the United States restored diplomatic relations on 20 July 2015. In the 1950s Cuba was a popular destination for Americans: good exchange rate, nice beaches and casinos only 180 miles from the Florida coast. 

That all changed with a revolution led by Fidel Castro and Cuba became a communist state.
China and Vietnam are still ruled by the communist party, Vietnam has casinos within its borders and China has Macau. So it is not unthinkable that Cuba will again have casinos. 

Chinese developers are already taking an interest with Mrs I-Fei Chang CEO of Greenland Holding Group, a Chinese development firm, stating that the extent to which Cuba might engage in casino projects is as yet unknown but could see a similar situation to that in Hong Kong and Macau.
The Cuban economy certainly needs more investment and more revenues to help re-build its ageing infrastructure. China is Cuba’s largest trading partner so the possibility of Cuba having super casinos is not as far-fetched as some may think. 
Let us just dream for a moment that it does actually happen. What are the likely repercussions in the USA and the Caribbean? 
The exchange rate between the US and Cuba will make the Cuban vacation attractive. There is likely to be more investment and bigger better hotels with five-star luxury. It will become an attractive destination particularly amongst America’s Spanish speaking population, same language and same food is always a draw regardless how cosmopolitan we think we are. 
What unintended consequences could occur that may help gambling internationally? 
The law of unintended consequences if often cited but rarely defined. It is the actions of people, especially government, that always have effects that are unanticipated or unintended. Adam Smith, in the Wealth of Nations, described it as the invisible hand. Smith said each individual, seeking only his own gain, “is led by an invisible hand to promote an end which was no part of his intention,” that end being the public interest. “It is not from the benevolence of the butcher, or the baker, that we expect our dinner,” Smith wrote, “but from regard to their own self interest.”
Would a Cuba casino market, along the lines of Macau, destabilise the US gaming industry? New York is not that far away with a three and a half hour flight time, weekend vacations are feasible. Cuba is warm throughout the year, great beaches, great food and the promise of great hotels. 
With budget airlines offering discounted rates I fear New Jersey, Philadelphia, Connecticut and even the Canadian casinos would come under pressure. 
When you cast a stone into a pond you never know how far the ripples will go! This ripple may cause consolidation in the market a loss of revenue for the states and the possibility of making up the short fall through passing internet gambling legislation. You just never know.
When Castro took the helm in Cuba, however, one of the first things he did was to shut the casinos. Gambling does not align very well with the communist doctrine where the state will provide and not lady luck.