The real next gen wow moments usually took a year or two IMO. If I had to name some of the exceptions the Xbox 360 had Kameo and Call of Duty 2, which were both much better than the Xbox IMO. The PS3 had Motorstorm and Resistance if I recall correctly.
We've never had a mid gen upgrade before either. There's simply not going to be as big a wow because the X1X and Ps4 Pro exist. We're just going from 4k (or upscaled) and maybe 30 FPS to true 4k 60 with some ray tracing thrown in. Normally, we'd be updating 5 year old consoles.
There's just not going to be as big a jump, because we already made two jumps this gen.