While the alternative to a 2 party system may seem obvious, a 2+ party system that's not what you actually get. From a US-type "winner take all" with influential groups & individuals, to preportional representation you end up shifting negotiations into shadowy back rooms amongst unelected officials. In addition, that 3rd option is never coming from the middle. The sizeable movements are even more extreme, pulling the major parties further to some sort of preceived binary position on every topic.