@ JEMC:
No I absolutely don't think 60fps will be common late in the cycle. But devs will most likely aim at 60fps before considering 4K. So even simplistic game which could probably run in 4K won't because if they have to choose the developer will pick 60fps instead.
And yes: Todays 4K TVs are of course only 30Hz. HDMI 2.0 isn't here yet and TVs would have to use Displayport or something similar, which isn't really common.







