The answer I was looking for was how long it would be able to play graphically demanding AAA games in the future.
This is a bit tricky question to answer. Like I have said before, the future performance will all depend on the Game, whether it's graphic demanding or not. I can't predict the performance of future AAA games, but some are definitely going to demanding, as technology and GAME ENGINES evolve !
No GPU or hardware is fully future-proof though, IMO. A time comes when we need a more powerful GPU to play some of the future demanding games, which are taxing on the GPU.
Though, some future games would still be able to play on your current GPU, as long as your GPU is capable to handle the Game's ENGINE...Not all games are going to be demanding.
Some games are more CPU-bound.