I think that's going a bit too far. Not everyone enjoys FPSs where they slap a room's worth full of high detail in front of you and a pre-rendered 2D image in the distance. There are games that don't resort to such antics simply because they don't have to render huge open spaces.
Well sure, but why would I spend thousands of dollars on a computer to play games with graphics that don't take advantage of my hardware? If I have a titan and 4k montior I don't want to play metro, I want to play Crysis 3, farcry and planetside.. Sure you can have games that don't have wide open areas, but essentially you have crysis 2 at that point. They couldn't take full advantage of the cryengine because the setting of the game didn't allow them to. Metro has an amazing engine, but personally I think the game looks like garbage because of it's styling and setting.
Enthusiasts who are making the investment into 4k aren't going to want the closed quarters console style gameplay. And while I will be buying a 50" 4k TV to use as my daily driver, I wont be gaming at 4k. I'm buying it so I can have the extra usable screen realestate.
seriously, you have to drop at least $1500 on graphics cards to even get started at 4k.