Err, replacement is maybe too strong a word. I should have said alternative. I don't have any such ambitions, but I plan to use this instead of bbcode on all my personal sites from now on. There's a lot of room for convenience in the form of transformations like I did with the tables. I could use this for my blog editor and add a {coffeescript ...} and {dart ...} tag for example, or automatically pass closure on js code. For users, it's really powerful because it can let them use style tags safely on elements.