I agree it has some great upsides. I love the idea of localization, and version control is nice to easily revert changes, etc. Having a scalable comic that can change text on the fly is something that I've been hoping for for a long time.
But I think you're strongest element is the WYSIWYG editor, as most people aren't going to be coding from only the HTML view (unless they know what pose="-11,9|-5,117|-11,99" will look like in their heads). But the WYSIWIG interface is still pretty anemic, meaning I'm going to run into roadblocks faster (such as -- how do I create something like a tree? How can I add a hat to the man?).
I want to provide a nice blend between visual editing and source code editing (I'm a developer). Poses and transformations should be edited visually, but scene structure should be edited by hand via the code. This way you get total control over document structure. Creating good visual-only editor would require too much work and maybe it is not possible at all. Do you know any successful FrontPage-style HTML editor? Quite frankly, I don't need it myself, so that is the primary reason, I'm probably not going to build it at this point.
Actually the system already supports attach points, so you can attach items to hands, foots and necks (right now the bubble is attached by default to a head bone).
The last generic piece which is missing will be <drawing> element. Right now it just allows you to specify lines. In the future it will enable you to insert any SVG which is convertible down to paths. I will just resample them and convert them into XKCD-style lines while keeping other styling. This will enable you to insert arbitrary SVG drawings in the scene. I won't create web-based photoshop for SVGs, I will let you import SVG created in other tools as long it is convertible to paths. Imagine it as embedding bitmap images into HTML files. This will be similar idea.
But I think you're strongest element is the WYSIWYG editor, as most people aren't going to be coding from only the HTML view (unless they know what pose="-11,9|-5,117|-11,99" will look like in their heads). But the WYSIWIG interface is still pretty anemic, meaning I'm going to run into roadblocks faster (such as -- how do I create something like a tree? How can I add a hat to the man?).