Not really. My TV takes uncompressed data. Once an encoder is available, the only things that matter these days are whether the following things support the codec:
- Chrome
- Safari
- Firefox
- iOS
- Android
- YouTube
- to a lesser extent, OS X, Windows, and Internet Explorer
If you cover those, all other clients of the codecs are lost in the noise, so it is probably safe to use it on your own site for your own content.
It doesn't really matter at all whether the codec used to encode the content for delivery is the same as the codec used to encode it during production. In fact, I would seriously hope that 100% of video production is being done with a higher quality codec than the low-bitrate crap that is being used to deliver content over the 'net. Therefore, whether Mitsubishi et al choose to support a codec or not is mostly irrelevant.
In practice, only three companies actually need to work together to make such a patent-free codec happen: Apple, Microsoft, and Google. Firefox would quickly adopt any patent-free codec that those three got behind. That makes the entire rest of the industry pretty much completely irrelevant. Those three companies could mandate a transition to a new, patent-free codec, and the entire world would practically trip over themselves to make it happen.
So no, those industrial giants aren't really a problem. In fact, they aren't even relevant in the grand scheme of codecs except to the extent that the big three graciously allow them to be.