When it come to single player story driven games, I'd take 4k30 with other settings bumped up. Even a 1440 with all the "bells and whistles" over 60fps.
If I'm playing a racing sim or multiplayer online though, give me the 60 any day. Even if that costs 4k and it goes down to 1440. More options in games next generation is going to happen. It's been a noticeable trend for the X an Pro and I do expect it to continue into next gen.
I feel like this topic has been done to death. I actually got deja-vu while typing out this comment.