RCV is a fantastic idea, but it is very difficult to get it installed on a large scale. Only one state has tried (Maine) but their state Constitution as currently worded seems to disallow it (as their Supreme Court has warned them). So for many states you'd first have to amend the Constitution to allow for RCV (or go for broke and try to get RCV enshrined in your Constitution) and then hope that those who benefited from the previous First-Past-the-Post systems will act against their interest to implement it by law or will refrain from enacting laws to overturn a citizen's referendum (which is my home state of Utah's preferred way of invalidating all citizen referendum). That said, while it's not a perfect solution it leans so heavily towards resolving many existing issues that I've long decided that if any politician publicly supports it as part of their campaign they'll have my vote.