Open to Debate just released a podcast about the need (or not) for more parties in American politics: Does America Need A Third Party.
Andrew Yang argued in favor. In fact he thinks the right number is probably five - break the democrats in half, break the republicans in half and throw in his Forward party. There is a great case for the first four of these - see this WaPo article from last year. I've suggested forcibly breaking them up, antitrust style. Another approach would be term limits for parties. Yang is growing on me. Reforming the electoral system is a much better platform than universal basic income.
Daniel DiSalvo argued against the motion. Actually he mostly just said that even if everything is broken nothing is going to change so why bother. I think that's 99% right, but not really in the spirit of a debate.
Open to Debate is a rebrand of Intelligence Squared US, which debated the same issue in 2021. In that case the status quo won the day, probably as it was defended by PJ O'Rourke, however the actual vote was 50% more parties and 40% keeping two. Unfortunately I don't know who won this time because Open to Debate has given up on the competitive format and even spirited questioning. You have some back and forth, and some carefully chosen and curated questions like a Biden presser. The original (UK) Intelligence Squared seems to have given up on the big issues and puts out Burgundy vs Bordeaux and people with a book release to plug. Canada is the only real hope right now with the Munk Debates.