Consoles have a longer cycle than PCs which is why they give this feeling that starts from "it's good enough" which gradually fades to "PCs are so much better".
For instance, PS4 started with Jaguar CPUs and 7870 graphics. It's still the same thing with slightly faster graphics (RX470 level?) after the recent "Pro" upgrade. When it was first released, it was a good little gaming rig, but now it's just subpar compared to 4 years of PC upgrades.
At the end of this year, when Scorpio comes out, you may have a Zen/Vega rig and it'll start all over again: consoles will be 'good little gaming rigs' and seem like awesome bang for buck. Now, fast forward to 2 years later with PCs on Zen++ and Navi ...not so awesome anymore, right?
The good thing about consoles is that things 'just work'. You don't have to worry about settings, you know you'll get 1080@60 basically... If you had a console released every year, it would break the model as games cannot guarantee that level of performance over the past 4 years of released consoles.
I've read this from so many people... Same about when they went from 60 to 144Hz. Same about going to 4K.
I wonder if there's some choice-supportive bias involved. If you did not have a 1440p, just experienced it at some demonstration rig in a PC store, then went back to your 1080p at home... would you still feel the same?
In any case, to me, minor updates don't really matter. 1080p to 1440p? Not so much. 1080p to 4K? Yes, that's a nice upgrade. I just need it to be 60Hz.
Which is, I guess, the reason I don't upgrade. Even a GTX1080 does not do a minimum of 4K@60 easily with room to spare. By the time they achieve this, the cards will be more reasonably priced, and there'll be cards doing 5K at just about 60FPS, but I won't care!