The article was posted on HackerNews, you can find a lot of discussion about it there: https://news.ycombinator.com/item?id=26114863
Great article, I can tell you admire simplicity as I do. Personally I think JSON would be a great way to go. While it is far from perfect it is a lingua franca. For 3D graphics, glTF is based on JSON which I think is one of the reasons it is growing in popularity, and far more successful than Collada. glTF also has binary variant; you could imagine doing the same thing for a SVG-style format.