By sitting on his high horse and proclaiming Markdown "works for him" and that his unspecified version with tons of nasty edge cases is canonical and that not only is it correct, he won't weigh in on any formal specification, he deserves to be case aside and have the project taken forward without him. He doesn't have a moral claim on something as simple and widespread as Markdown, and the fact that he finally has to deal with someone with similar blog reach going on a crusade is nothing worse than he deserves for sticking his head in the sand.