I really don't understand why anyone would make a 4k/120fps game when hardly anyone has a HDMI2.1 compatible tv... This sounds more like a marketing scheme than a true next gen game reveal. Oh, well lets hope not all Series X games will be aiming for such crazy fps and resolution numbers.
Demand will increase as content exists. I had no need for a 4K until I got a X1X.
It's certainly possible many games could offer a 120 fps mode. 8th gen games could have it patched in, which is suspected to come for Gears 5 and Gran Turismo.
Newer visually demanding games could also offer it at the compromise of resolution, assuming the CPU is up for the task. I would be surprised if Forza 8 doesen't have 120 fps.
Anyway, its an easy feature to add and it would encourage people to get 120 fps TVs.
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