Of course not. Don't engage the deluded. Let them have their 720p.
Actually, it's simpler than your advice. Right now a 4K

TV is a
rumor, albeit one seeming to gain a lot of traction in the last week or two. As soon as Apple takes to a stage and rolls out a 4K

TV, this anti-4K sentiment quickly evaporates.
The exact same thing happened in the days when Apple still clung to 720p as "HD" (maximum) before announcing the 1080p

TV3. Back then, all of these same arguments being made against 4K were being slung around against 1080p. 1080p is a marketing gimmick, you can't see the difference, "the chart", until everything in the iTunes store is available at 1080p (which is still not the case by the way), until everyone's bandwidth everywhere is upgraded, hard drive storage and on and on.
One of the best: "I don't want to throw away a perfectly good TV set because..." implying some perception that better hardware will "force" everyone to only download 4K video, in spite of an obvious history that advancing

TV technology can still download SD, 720p and 1080p versions rather than only 1080p versions. (this will be no different). A 4K

TV is going to play 1080p or 720p or SD to it's fullest as better hardware always has no problem with lessor software demands. Hook it up to a 1080p or 720P HDTV and it's just going to be a better, more robust

TV4 with a hardware capability that you can't use on that existing TV. Your iPhone has abilities to tap cellular bands that you don't use either but it's added hardware capability built in should you ever want to change providers and thus need that hardware.
So basically, the crowd that seems to passionately argue for whatever Apple has for sale right now is just doing their (paid or unpaid) job. Note how you tend to not find these same people in threads for all of Apple's other products that already embrace 4K bashing against Apple for embracing "the gimmick" in iPhones, iPads & Macs- only here with this ONE Apple product that does not yet embrace 4K.
As soon as Apple has done the big reveal, the vast majority of this crowd will not dare show up to bash Apple for stupidly embracing "the gimmick" that "no one's eyes can see." Instead, it will be "Shut up and take my money" and the same old, TIRED arguments will go into the long-term recycling bin to be revived again as rumors start picking up for 8K a few years down the road.
We've already seen this exact same movie before and after the "3" was announced. I expect no difference here. A God will speak and then 4K will be fine to all His followers forevermore.
