I just thought it was kind of self-evident. Third party candidates don't win anything. They simply play spoiler in favor of the the other side. That's the way it has always been since the demise of the Whig party, and that is the way it will be into the forseeable future.
The only way I see for another party to arise is if the GOP abandon its pro-life stance. But were that to happen, we would still have a two-party system, though, because one of the two current parties would pass into the dustbin of history.
That is usually, but not always, true.
They simply play spoiler in favor of the the other side.
Only if they get more votes than the "other side"s margin of victory. But a third-party vote is always a message to the major parties.