Are you an AMD user, right? That’s the only conclusion I can draw from our current conversation so far. 
Epic might have stated that GameWorks won’t be added to UE4 before but that’s not what their users want, and let’s not forget who’s the real boss here (remember the capitalism part about competition, profits and sales).
You seem to think that 2015 is going to stay around for 3-4 years or something? NVIDIA GM2xx came out last year and it’s probably first in the series of chipsets which will do better and better with GameWorks, among other things. Progress waits for nobody and someone who still has a GTX 580 in 2016 will be left behind (they already are, and so are GTX 6xx owners).
Technology improves dramatically, but some people think that vendors should stay behind and support their ag-ing/-ed products. That’s not how capitalism works - case in point Apple who forces their users to perpetually upgrade their hardware and software every 8-12 months. NVIDIA and AMD are no different, they have boards of directors and shareholders who demand ever increasing profits, and companies leverage every (sometimes dirty) trick in the book to achieve those.
Coming back to UE4, we are not going to see as many titles with it yet for another year (or more), but when they do come out they will definitely not run well on GTX 580 or 680, or AMD R9 290x, because these cards would’ve been 3+ years old and no one makes future games for old tech. It does not the game well, nor the engine tech, and neither keeps the longevity of the game. Everyone wants their games to last years ahead and they need to compete with other games, equally good and amazing.
Anyway, I hope I got my point across without going to far out of the thread subject. We can have another thread where we can debate economics of the hardware market and tricks vendors do.