Take it from a guy who lives in a 3 main party system and is currently in a coalition government. Who is married to an Italian, where they have - at last count - 17 major parties.
It does not work. Third party is a pipe dream. Pick up your pack and shovel, get out there and fix things. Don't care which side you try to fix - but fix it.
That is why OWS failed. It wasn't the media. It wasn't the assholes who took it as a chance to "stick it to the man" (and a fair number of unwilling women). They were protesting. Did you hear a single, rational and workable fix for the problems caused by Wall Street and K Street? I didn't and I was working that story pretty much 24/7. There was much bitching, but no fixing.
The Tea Party did some better. They got out and got people more closely aligned with their views elected. Unfortunately, not enough.