And yes, even in 2016, there are games that are playable on those cards. There were more new games that could be played than there were that could not back in 2013 when AMD completely dropped support for its equivalents.
I still have a 5850 lying around and recently I put it back in a spare gaming rig to test, it ran all the new games fine on low/med details. Even Battlefront ran very well. That's using old drivers.
I consider that good considering how old it is. I don't have anything older than that on me to test though.
So rather than looking at the date of a driver, one would have to look at how it performs instead because that is the ultimate purpose of a GPU.
Classic example, NV loves putting out "Game Ready" drivers, the last for Ashes, did nothing, no difference in performance or visuals. Why is it "Game Ready" and what does that even mean? Their last "Game Ready" MS certified one caused BSODs and boot-up-lock they had to remove it and release a beta.
Another prime example of "Game Ready", in Rise of the Tomb Raider. It's good that they release a fast driver for it (AMD's driver to improve perf & fix Fiji was 3 days post-release).
But look at the 770, 780 and 780Ti. These aren't that old, but it looks like "Game Ready" do not apply to them. We've seen this again and again, when NV sponsors game development, Kepler tanks.
I don't consider this good support. Someone who bought a 780Ti for $650 in 2014 is basically spat on with this kind of business practice.