No I think it will be fine but I really don't know I've seen the 4K demos at the electronics stores only really and they make sure they are always showing you the amazing looking 4K demo videos. I imagine though if they didn't show the other resolutions decently that the consumers would be out with their pitch forks (on the internet of course) blasting the TVs and warning the public not to buy them. Their are already nah sayers on 4K anyway here are 3 fairly recent articles (are they still considered articles when on the web) that may help you out. That being said if you want to make a purchase on something and you aren't worried about being an early adapter of new tech then it is feasible to get in now on 4K as I'm sure they are creating more content for it.
https://www.cnet.com/news/why-you-shouldnt-get-excited-about-4k-and-hdr-gaming-at-least-not-yet/
http://www.businessinsider.com/4k-pc-gaming-not-worth-it-yet-2016-7
http://www.pcworld.com/article/2990895/hardware/the-state-of-4k-gaming-what-you-need-to-know-from-pricing-to-performance-needs.html