Sure, but I expect that's more because no one wants to tell everyone their TVs that they were forced to buy in the mid-2000s are obsolete and they must buy a new MPEG-4 (or whatever) capable TV in order to keep watching broadcast television. (Of course, cable networks can do whatever they want; they can just build new decoder boxes if it's worth the expense to them).

Terrestrial broadcast standards have to move slowly. Internet-based streaming and storage can move much faster, and it's supremely beneficial to be able to do so. MPEG-2's now-expired patent portfolio isn't too useful for that, and hasn't been for quite a while now.