It turns out it has already made a difference.
The following is from the Atlantic.
HOW FIDEL CASTRO HELPED VENEZUELA'S JEWS
"I understand that anti-Fidel people are saying that his statements of affection for Jews and his statements of hostility toward anti-Semitism were cynical and about politics and the need for international respect, but from our perspective this does not matter. Fidel's words against anti-Semitism changed the way the government here talks to us and protects our institutions. The leader of our country showed us a lot of respect in our meeting, and we are glad the Cuban ex-president said the words that he said to you. It is difficult for Americans to understand (I also spend a lot of time in Miami) that Fidel is respected greatly in Latin America and in Venezuela. If he had said something hostile to our position, it would be terrible for us. With God's help, we will survive as a community in Venezuela.