But JPEG2000 was absolutely crawling with patents like maggots and worms writhing through the very core of its being. If that didn't put everyone off then I don't know what would? Certainly ruined my lunch.
DJVU was another contender but it just happened to be tagged on to a PDF-like docuemnt format and not widely known as just an image format.
Finally, anything that was not (properly) supported by Internet Explorer ten years ago was a dead duck. And Microsoft and Apple actively snub any open format if they can get away with (like Vorbis, WebM etc).