Ask HN: Time to update JPEG compression algorithm?

It has been a while since JPEG Mini and then Kraken et al. introduced their advanced JPEG compression algorithm which reduces the size of an image encoded with default JPEG compression further by up to 5X.

Given the immense tangible benefits of reduced image size on the web (more responsive, faster page load, better UX etc.), what's stopping the open source community, OS and browser vendors to start supporting this advanced JPEG compression? After all, it's the most popular image coding on the web.