No reason to upgrade...
* Prefix this by saying I'm mostly the car-racing / shooter type. So coming from that POV, games on the Xbox-180 or PS4 have only marginally better graphics and the gameplay isn't much better. Take Forza-Horizon-2 with its cars falling through the landscape etc. Driver-SF is a better looking open-world driving game (despite being ubisoft-ware)...
* I still play early driving series like PGR3/4 too... It hasn't got the shininess of the latest Forza or all the latest cars, but it drives well and the game is just more fun.
* I still highly rate Far Cry 2 and find it more enjoyable and more cohesive as an interactive experience than FC3 or FC4, and I own them all.
* Same with COD... Sure, there's bots / zombies in later versions, but that's about it. The PC version had bots / zombies since COD2 / COD4, plus loads of free user maps....
* Still prefer Hitman-Blood-Money, its more fun than Absolution... Still play a lot of Skyrim too, because its just so beautiful...
* Have games really gotten any better? Console games anyway... Maybe its me, apologies if so..