Cuban cigars are not any better or worse than Nicaraguan or Dominican ones. They have a unique flavor because of the soil the leaves are grown in. Many people enjoy the taste of Cuban cigars over other countries because of their unique flavors, but there are many people who would rather smoke something else.
My dad smoked cigars for over 40 years, his favorite was the Macanudo Prince Phillip. He had access to any cigars in the world and would bring me Cuban cigars whenever he would travel abroad. I happen to love the taste of Cuban tobacco so that is what I smoke most of the time. I also enjoy Nicaraguan puros, i.e Padron 1964 Maduros and Dominican cigars with Cameroon wrappers, i.e Fuente Don Carlos.
Yes there are people out there who say they only smoke Cubans because of the taste, but in reality it is because of the forbidden fruit aspect of the cigars. In my opinion real cigar smokers will enjoy cigars made in different countries, yes they will have their favorites, but they are still able to appreciate cigars from all over the world.
When Castro dies, the cigar industry will change also. What type of change, no one can predict.
The growth of Cuban cigar mfgs. will likely go through the roof when the embargo ends. If mfgs like Fuente and Padron are able to go to Cuba and grown their own tobacco, the quality of the cigars coming out of Cuba will likely quadruple. It will certainly be an exciting time for us cigar smokers.