Communism will never be “buried,” any more than entropy will ever be “buried.” They are the same thing.
But my "Ashcan of History" optimism stems from this: When people see the natural conclusion of Communism, its death camps, its slavery, its dehumanization, its nihilism, which we ALL have seen this past century, people generally are wise enough to think about turning away from it.
This is an advantage we have now with a somewhat better informed populace and a religious revival emerging.