The pace that cable adopts h.265 has nothing at all to do with Apple's ability to adopt h.265 (and Apple ALREADY is using h.265 for FaceTime). All these other players don't have to change before Apple could roll out such an

TV. Instead, Apple could lead by rolling out a new standard and then it would be on these other players to play catch up (but even there, it wouldn't matter if a Comcast ever adopted h.265 for their video delivery).
As to "strangling" (data caps, etc), anyone in a strangled community could choose to download 1080p or 720p or SD versions of files. A 4K

TV doesn't force anyone to only stream 4K video; it just makes that possible for those who desire it and are not in strangled areas.
While I share some of your pessimism about broadcasters adopting it for cable or over-the-air even before the end of the decade (it took them a VERY long time to shift from SD to HD even with a GOV mandate), I was surprised to see that over-the-air 4K is actually being tested:
http://www.prnewswire.com/news-rele...s-of-emerging-atsc-30-standard-300111554.html While I had generally come to assume the path to 4K quality was probably another round of discs and streaming from an industry leader (like Apple), there may be some hope that at least some broadcasters might do something with 4K even at the over-the-air level.