Knowing basically nothing about anything that’s relevant here, so pardon any ignorance, but it does sound to me like anything that moves the US towards a true multi-party system would be a pretty fundamental change?
To our democracy, sure, but not to our economic system. As long as our economic system is capitalist our democracy will always be beholden to the ultra rich, even if it is multi-party. Campaign finance reform is good, but nowhere near enough to eliminate the influence of capital on the political process.
I’m not so sure. I’m from a multi-party democracy, and while the ultra-rich (or, well, mega-rich I suppose - the US’s ultra-rich are at a different level I think) certainly have their interests catered to, I feel like on balance the scales are tipped to their benefit to a way smaller extent, largely thanks to the multi-party system.
What country? Virtually every liberal democracy is currently experiencing a far-right resurgence right now, with similar themes of austerity and lower taxes on the rich. Multiparty democracies, especially those with parliamentary systems, have greater immunity, but they’re all suffering from the same disease because they have the same foundational flaws.