American society is in crisis and this crisis will likely continue to grow economically as well as due to larger effects on the horizon such as global warming. From a practical standpoint if we are serious about unseating the power of the billionaire class (which is highly realistic as society continues to self-destruct over the long horizon) things like ranked choice voting should serve as tactical goals in a broader struggle for democratic process in our country. But yes it would be naive to consider ranked choice voting to be enough on its own to unseat them.
RCV is a weakass attempt to move us in the direction of the Westminster system without actually just fixing the system. You want Westminster just go there and don't fuck around half-assing it with RCV.