I can see 8K res coming to 27" computer screens, I've got an iMac 5K 27" and there is room for improvement with the pixel density when it comes to video/photo editing. But yeah I don't see it going much higher for displays, maybe for large cinemas. But I'm sure there will be other video/photo technologies coming up that will use large amounts of data. People just haven't invited it yet due to storage constraints.