It is, but if we work together we can stop it from taking over the world!
Some day, humans will evolve beyond greed, and there will be no point in keeping capitalist societies anymore. Unfortunately, that day is far in the future.
How about we find a nice balance, and stop spewing all this $hit about being one or the other?
The only thing that is inevitable (based on history) is the continual rise and fall of structures. As we grow more advanced the cycle may become longer, but I still believe we can count on destabilization of society as a whole eventually.