I really do not understand the obsession with multiparty democracy.
A multiparty system has been sold as the defining trait of democracy (or at least synonymous with an electoral cycle), election ballots must have little symbols for each little party. But even those who buy into it fall into inevitable contradictions: when, for example, they're made aware that nations like the PRC and the DPRK have other parties (similar to the post-imperialist scenario you've stated), they become quite perplexed; also, all these people would be only satisfied if the party they support won not only the general elections, but also every election in every region/municipality/district/etc, essentially desiring the one-party system they are feverishly against.
These are just brief points on how that obsession falls over itself, I purposely don't want to get into how the basis for the obsession (be it the electoral cycle, how a multiparty system actually behaves, etc) is a sham on its own.