It takes a while for the effects of party decentralization to take hold. The underlying party structure is at the core of two-party systems. RCV is just one incentive (a big one) to restructure parties to be more democratic and diverse, instead of coalescing into monolithic amorphous blobs. Along with Gerrymandering laws, campaign financial regulation and voter civic education. It all has to work in concert to dismantle the social control version of democracy.