People... geeze.
How many people said cell phones were stupid and were a waste when they first came out? Now darn near everyone has a cell phone. If the first people who got one took the advice of the nay sayers, we wouldn't have cell phones.
Same with HD TVs. When they came out, same BS argument was made. Why? There is no HD content out there. People who buy one are stupid. It's pointless. You can't see a difference anyway unless you get a 40+ inch. By the time content comes out you will need a new TV anyway. Yet people bought them, and now we have HD content. All of our over the air channels are in HD, I stream everything in HD, I watch Blu-Ray in HD. If no one bought the early TVs, then we would have none of this.
Content providers aren't going to spend money on something no one has. You have to start somewhere, right? People buy 4K TV because hey, shiny. Content providers say "Hey, people are buying this, maybe we should start producing, but start small and ramp up as needed". If no one bought a 4K TV, then no one would even bother with content at all. It takes time to ramp up, just like HD TV did. Just like color when color TVs came out.
Also, screw this absurd mentality that some have shown here. "I can't have this, so no one should have this." Good god, the world doesn't revolve around your tastes. What a waste to have heart surgeons, I don't need a new heart. Right?
As for the person who said that net neutrality will bring data caps, ugh. Take your tin foil hat off and quit feeding on the bull that your ISP fed you. Are you freaking serious?!?! Two things:
1. We've had data caps for YEARS. Comcast even advertises it as a freaking feature, like we should be happy to have this. Numerous other ISPs have data caps as well. Damn liberal agendas, robbing poor near monopolistic companies of money, forcing them to implement data caps or they will starve... oh, wait, you mean they've been already doing that while making billions in profits? Oh my.
2. This is a United States thing, not a world thing. Last I checked, the United States isn't the only country in the world, nor the only country that Apple operates in. Even if we end up with 1 GB data caps and 56K internet speeds, it doesn't mean the rest of the world will. Again, just because you can't doesn't mean others shouldn't.
For the people saying you can't see the difference anyway, either YOU can't or you haven't actually bothered. 4K YouTube looks better on my 4K monitor than on my 1200p monitor. I sold TVs a year ago - there is a clear difference between 720p and 1080p, regardless of distance. There is a very clear difference in DVD and Blu-Ray, regardless of distance. Regardless of TV size. We would play the same movie, on the same model TV, side by side on the display - one was DVD the other was Blu-Ray. There was a very real difference. My couch sits roughly 12' from my TV, and there is a huge difference between the 720p TV that sat on my wall and the 1080p that sits there now.