It's a question that changes with each new generation:
How long does the "older" console stay relevant among the gaming community?
For instance, I daresay the PS2 was very relevant for three or even four years after the PS3 launched. Obviously, it was due to the PS2's massive library, and the fact that it was a totally dominant machine throughout the previous era. On top of which, the PS3's slow start meant that many gamers continued to stick with the PS2 for quite some time. However, I'm pretty sure the same won't happen concerning the jump from PS3 to PS4.
The last generation dragged on for longer than anyone expected and as such, "generational fatigue" was a very real thing, experienced by both consumers and developers. It seems as if everyone was pining for the new systems and the instant they arrived, the PS3 and Xbox 360 just dropped off the face of the planet. Honestly, this might be the quickest and most abrupt shift we've ever seen from one generation to the next. However, this also means there's more pressure on the new consoles to perform immediately.
And let's face it, that didn't really happen in 2014. Therefore, I'm wondering if the PS3 experienced a bit of a resurgence during the year, just because we're still waiting on those stellar PS4 exclusives. Or, is the PS3 officially obsolete as of now?