Up until such a time as a hypothesis is tested, and proven, it cannot move past the stage of theory. As I have not yet been forced to test the theories on how to deal with a zombie apocalypses, I cannot therefore move towards proving the hypothesis. In otherwords, I got a good idea, but if I can't test it I can't prove it.
A certainly poor situation in which to find yourself, where failure is likely to result in your brain being eaten.