I don't really understand how Range Voting is better than Ranked Voting. Won't voters only grade candidates with the maximal or minimal grade to have more impact? But then, Range Voting was supported by very smart people (eg Balinski, Arrow), so I will try to read more about it and hopefully update my website in the future :)
Ranked choice voting would likely have the effect of eroding the two party system. Whether that is a good or bad thing is highly uncertain. I think it has a lot more potential to be bad and it isn't worth the risk.