The Xbox 360 and PS3 were actually the first generation of home consoles that I don't feel any particular need to upgrade, especially with all the juicy deals on PS Plus. They are "good enough" for me, and while I will upgrade in a year or two (when the next Elder Scrolls or Borderlands game pops up), with no support for PS3 or Xbox 360 games on the new systems, there's certainly no reason to hurry.
I can remember with the PS3, when they announced that BC was going away, searching madly for a MGS4 SE. Now, who cares when you buy?
And damn, are there some great free (and almost free) games on PS Plus - I'm on some gaming forums and laugh when the PS4 newbs continually ask "how can I play the free Borderlands 2/DMC/Dragon's Dogma/XCOM/Bioshock Infinite/etc." on my PS4?
That all may change when Playstation Now launches. Makes PS4 backwards compatible and will also let you play classic PS2 and PS1 games