That's a profound question.
I think the answer is that, we will only rid ourselves of that destructive ideology, when it finally brings the system crashing to the ground. That's what it took for the former USSR. It's what it's going to take here.
Sadly, I have to agree, and I was afraid someone would say exactly what you just said. I am afraid the whole thing must come crashing down as well. One thing that surprised me about the Soviet Union, was that I expected millions of victims to settle scores and kill many communists, who had oppressed them. I don't think it really happened that way, but we have a different kind of population. A collapse might bring on a blood bath of Biblical proportions. We shall see.