I think that comes down to organization. We can't expect teachers be the experts they are in X and also be experts in HTML, CSS, JavaScript, SVG, graphic design, interaction design, and animation.

I'm imagining Wikistration. Not necessarily based on Mediawiki, but it enables collaboration on interactive illustrations. Start with SVG, implement Inkscape in the browser, add the usual version control. Then level up with shared JavaScript scripts and SVG snippets so the community can build a library of templates like in other projects. With enough elaboration, a next generation editor could formalize some of the most commonly used stuff to accelerate experienced contributors and make it easier for beginning contributors to get in the game. Also, CSS libraries can probably get mixed in to make illustrations skinnable.

If enough momentum builds up, and people keep looking forward far enough, it might be feasible to merge it into Wikimedia Commons, though that would be a major scope change for the project.