I plan to upgrade only when it either starts malfunctioning past warranty, or it gets to the point where minimum required specs are too high that I can't run new games at all or its unplayable even at like 720p.
Had a 8800gt for years before that died (2007-2010) swapped with 6870 until it died ~2014, was only playing gw2 on IGPU for several months until I got a 960, that card still works. Then I was looking to buy a VR capable card. When the 20* series came out I felt the 2070 was too expensive so I ended up getting a 1070ti for $350. Great card as it runs DOOM VFR and Eternal fast at 1080p, I think the 2GB of VRAM on the 960 would have bottlenecked it.
If the 30* ends up being as powerful as Nvidia claims it is tempting to save up more for a better card, but I think my 1070ti can still run games for much longer, the next series of cards may be out by then.
