Quick answer: Maybe, but consider a projector as well.
I recommend anyone considering a UHD tv to read this first.
Don't start there, because that article, which advises against 4K TVs, is from 2013. Start with CNET's 2015 article, "
Why 4K TVs aren't stupid (anymore)", which explains that while the 4K resolution isn't likely to be noticeable, there are other new features that
are worthwhile and which are easier to find in
current 4K TVs.
Basically, when you wander through Costco/Best Buy/Sears/wherever, you're typically at 2 to 6 feet away from the screen, and you'll be able to see the difference in resolution. But when you get home, you're more likely to be at 9 feet away or more, and that's too far away to see a difference between 4K resolution and 1080p resolution. But in the meantime, the newest 4K TVs have better contrast (regardless of resolution), and they're getting cheaper. That means the 1080p TVs also have to become cheaper, and they do that by leaving out modern hi-tech features, such as the improved contrast. So if you're buying a TV, buy one with HDR for the better contrast, which means more likely than not, 4K. And don't worry about the lack of 4K programming, because you don't care, and may not even be able to tell the difference once it's available.
Which brings me to screen size and projectors. There are a lot of opinions about screen size, but a/v enthusiasts in general feel that most people buy smaller than they should. For some reason, the various calculators seem to either start with the screen size and compute viewing distance, or else they'll require both screen size and viewing distance and then tell you how you fare according to various recommendations (such as THX). The simplest one I've found is
this one from Carlton Bale, but you'll need to scroll down past the spreadsheet section to get to the "If the spreadsheet is too complicated for you" section. If I plug in the 65 inches cited earlier, it tells you that for 1080p resolution (the most common), you need to be within 8 feet of the screen to
fully appreciate all the detail. At 4K, you'd need to be within 4 feet. That doesn't mean that 4K at 8 feet will be bad, just that you won't be able to tell much difference between 1080p and 4K at 8 feet away. Also, this is one particular person's take on the various guidelines, so opinions and mileage may vary.
We have a 12 foot viewing distance, and I didn't want to deal with the weight of an 85 inch or bigger screen on the wall. But projectors have come way down in price, so we wound up with a 106" diagonal screen, and a BenQ 1070 projector. Yes, 106". The projector was about $700, and is still available from some sources, though the latest model runs $800 - $900, depending on where you get it. Add up everything - project, screen, ceiling mount (where we spent way more than necessary), HTIB (Yamaha receiver plus speakers), and electrician to run a power outlet to the ceiling, and it probably comes out to about $1500-1800 (the electrician did other work too, so it's hard to factor, and I don't remember all the numbers). That's not counting the blackout curtains, since we needed new curtains anyway. We have zero regrets - the huge screen is great.
There are gotchas around projectors that require doing your homework. The biggest problem is that the sort of high-end A/V places that know about projectors don't carry the inexpensive ones like we got, not because they're bad, but because they can't afford to sell at that price point.
