because people talk about a “next gen jump“ for consoles. just because ps4 won't be better as a few years old pc doesn't mean it won't be a next gen for consoles. but i also call wii u next gen so, yeah 
and games will improve even if consoles don't have the power of pc. most games on pc which are also on console only run with higher res and stuff but the environment is the same. with next console gen, developers will put stuff in the levels they didn't do before, they won't just make the same game with higher res and higher framerate.
we get whole new engines with the new gen, we don't get them just to increase the resolution.
who knows, maybe we will still get games with 720p and 30fps but with much better looking levels and physics and stuff and pc will play them in 1080p and 60fps then. that would be a possibility to increase the look of the games a lot just not for resolution and frames.
