I'd argue that it is not possible to have an end. Culture and society, like species, continue to evolve and is never a static thing (believing otherwise is one of the big contradictions of neolibs and other staunch pro-capital ideologies). So, "post-communism" could be a set of philosophies that may not be concievable until such point that humanity has evolved culturally and socially enough. Possibly influenced by technological or external factors.