When recently asked about starting a third party, I said that we might as well just go hunting with Dick Cheney and get it over with. But I've had an epiphany. Telling someone NOT to do something is just not me! I have always felt strongly about encouraging activism, not discouraging it.
I attended many Howard Dean events during the 2004 NH Primary and one line that he used over and over was "You've got the power! It's not me. It's you!"
So it you want a third party, stop sitting around on your behind and yakking about it. Do something about it. Come up with a catchy name, raise lots of money, get some good candidates and do it. Don't wait for some messianic savior to some along and do it for you. Don't wait for Howard Dean or Hillary to come along and do it for you.
Gene Sharp, former Harvard professor of Sociology and Political Science and founder of the Einstein Institute told Eastern European countries for decades, "Don't wait for NATO or the USA to come and save you from Soviet oppression. You have to do it yourself. You have the power." And guess what? They did it themselves. The Hungarians opened up the border to Austria, the East Germans took down the wall. They had the power all along. They just didn't know it.
So if you want a third party, start it. Me, personally, I'm kinda busy right now taking over the Democratic Party. Also not an easy job, but the time for yakking or waiting for Godot is over. (You know, in the play by Becket, Godot never shows up!) Remember, we've got the power.