Communism, like most political isms, failed coming out of the gate but that doesn't mean it still didn't have its fanatical supporters and doesn't have them regrouping now.. They'll just call it something else, another 'ism' will take its place, and many in the democracies will support this new 'ism. We see that now with Islamism and its support from the same dysfunctional minds who previously supported Communism, Fascism, Nazism, and so on.
These isms are not just a one-off and then relegated to the dustbins. They are a constant plague on the civilized world, with just the names changing, and they never entirely go away. They only complete with each other for which will the most dominant at any particular time.