Serious Question...how can you possibly NOT be a libertarian?

[PugnacAutMortem]

Therein lies the problem: The libertarian movement is too small to be taken seriously by most voters, but the movement needs voters to consider them a viable choice to grow. The other alternative is that the major parties finally put forth such horrendous candidates that a significant number of voters can no longer stomach voting for the lesser evil, and choose instead to take a chance on the unknown quantity.

The only other way (besides your scenario) is for someone exceedingly famous to run on a 3rd party ticket. Your scenario is the most likely, as unfortunate as that is.