I'm pretty fine with 16:9 instead of 21:9 as the standard aspect ratio, at least for however long ATSC lasts as a standard. Something tells me it's a little optimistic to hope we get 50 years out of it like we did with NTSC, but it probably has at least a decade or two of mileage left in it. In my unscientific opinion displaying 4:3 content on a 16:9 screen (and there's a lot of 4:3 content out there) without stretching/distortion wastes an "acceptable" amount of screen real estate compared to the nearly half the screen you'd lose with 21:9. (Of course, there'd undoubtedly still be morons who'd stretch 4:3 to 21:9 because making everyone look like Stewie Griffin is somehow preferable to seeing black bars on the screen, but I'm going to pretend those people don't count.) Yes, then there's the problem of having to letterbox cinematic content and wasting a similar proportion of screen real estate for movies in their original format, but I don't use my TV *just* for movies so I'm fine with having to compromise a little.
(If you want to be pedantic even 21:9 isn't wide enough to show full CinemaScope without cropping or letterboxing.)
Nor am exactly chomping at the bit for 4K. The data transfer requirements are still unwieldy; you basically need a hard disk to carry a full resolution 4k movie around and given how American telecom companies are prioritizing squeezing ever more money out of their subscribers over building out their networks streaming isn't going to be a realistic option for a while either. And further, unless you sit too close to your TV or have built your own full-up Home Theatre the increased resolution is mostly wasted anyway. (
Chances are really good that your existing HD TV is already a "Retina Display" according Apple's definition.)
Yegads. My Sharp brand TV was set up to do that out of the box and I think I was about five minutes into the first cartoon before I was frantically digging through the menus to disable it. (Luckily you can.) It's *weird* and sort of unnerving; it adds this strangely reptilian "slithering" aspect to animated programs on top of making live action movies look like cheap soap operas. Seriously, who asked for this feature?
If you'd asked before I'd experienced it if I thought the human brain would even really be able to perceive the "halfway" frames being generated between the real ones I would have been somewhat sceptical of the idea. But, no, it does see it, and it's scary as **ll.