Yeah, it doesn't quite have the same ring to it. I get why they used the term 4K, and a decent amount of people actually did know that movies mastered at 4K is the high bar. It was always marketing.I can't wait to get my 2160p TV.
Unfortunately, they have went and made things super confusing for a lot of folks, switching resolution to cinema terms. That's why this is even a discussion. I'm just trying to help clarify and simplify, because I actually "see way they did there".