Ranked Choice Voting is not a good system. First, it isn't transparent, won't work well for elections on which there are a lot of candidates and it would be cumbersome to do across a complete ballot.

Second, from your own link: "it is unclear to what extent Americans actually desire a third party, as opposed to just expressing their frustration with the two parties that contest elections and govern in the U.S. two-party system.:"

Third parties are indeed spoilers- Nader threw the election to Bush in 2000. Both Green Party (Stein) and the Libertarian Party got Trump elected. A strong third party at the presidential election risks no candidate getting the required 270 Electoral votes and thus throws the election into Congress which, due to the GOP control of more states than Democrats control, guarantees a Republican presidency per the rules in the Constitution that govern that process.

Then there is voter fatique. Too many voters do not even vote on the non-partisan sections or on ballot proposals.

The two major parties are not each monolithic. Each encompasses coalitions within, though arguably the GOP has far less factions within it than do the Democrats.