> The two-party system is fine.

Is it? Many western countries are having more or less prominent populist right wing movements, and the two countries I can think of where that movement has gotten its hand in power on really significant issues during the last decade or so are UK and US. Both strongly two party systems at the time of the "interesting" developments. And I do not think a two party system is typical, I am sure there are some countries happily trodding along with their two political parties, but they are not the rule.