In 2020, 4K will be passe. The 2020 Tokyo Olympics will be broadcast in the 8K resolution, which is four times deeper than 4K.
The 8K resolution -- 7680 x 4320 pixels -- will make movies will look stunning, and gaming will be even better than on today's PlayStation Pro or Xbox One S.
There's a good chance you aren't thinking of 8K yet because you haven't even moved to 4K. The early 8K adopters will be gamers looking to buy the latest and greatest hardware, and creative professionals making 8K content.
Content creation is as important as the hardware itself, and efforts to broadcast at 8K are underway. PCs are getting ready: Microsoft has said Windows 10 will support 8K.