Updated
There's been a lot of TVs released recently that can handle 8K screen resolutions. From the 1st of January 2020, the Consumer Technology Association has come out with a list of several parameters and requirements in order for a TV to bear the 8K logo.
Some of the requirements (of which most TV models today already fulfil) for a TV to acquire the 8K logo include:
Currently, there's not many forms of media that are filmed in 8K (referring to films and tv series of course). The only popular film known to have been filmed using 8K cameras is Guardians of the Galaxy Vol. 2. Even when discussing upscaling and pixel density it's still really only 4K or lower resolutions that make up the bulk of what's out there. For this reason, we can guarantee that you can rest on the sofa and enjoy your current TV for at least a little while longer.