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Yeah - bring it on! Two encouraging responses to the "Future of Markdown" post by Jeff Atwood: (1) John MacFarlane's comment, and (2) the expression of interest from Github. But apart from that, Markdown Extra's solutions are perfectly sensible. Time for action!
Like others, maybe not needed for SO, but for my *.SE contributions, I could often use them. Also, if the PHP Markdown Extra solution was adopted, it would mean that you wouldn't need to worry about manually adjusting footnote reference numbers when adding a new note "above" existing ones. AND you would have the note and intext reference hyperlinked. SO many plusses! What's the down-side? I can't think of one.