The situation with webM is that it was optimized for low rez video, for which it provides slightly better quality with slightly better compression than H.264. The problem is that WebX was developed for low rez video, while H.264 was developed for higher rez video.
when higher rez video is made, and played back, the situation is reversed. Then WebX has poorer quality, and less efficient encoding than H.264. The differences are fairly easy to see. The higher the rez, the greater the difference.
while Apple’s ignoring it had something to do with its loss of interest, the main reason was that as higher quality was being shown on the web, H.264 was preferred. Nobody wants to be accused of showing lower quality than their competitors. And the fact is that the license fees for H.264 and it’s successors is rather small, and doesn’t affect 90% of producers, and it affects 0% of users. Only large producers pay a fee that‘s significant, and that’s still tiny compared to the costs of production and distribution.