No issues at 1080p. The Witcher 3, if it's as power hungry as I imagine it's going to be, might bring it down to 40-50fps, at a guess, if you have a slower CPU, but it should still be a killer card for at least a year. I can't imagine any new games coming out in 2015 that will seriously push the new Maxwell cards, except maybe The Division and The Witcher. As said, based on the few benchmarks I've seen, even 1440p is possible with a single 970 as long as you don't crank everything else and expect 60+ FPS.
I'm somewhat in the same boat. I'm aiming to sell my 770 and picking up a 980 later this year, then a 2K monitor around this time next year, and another a 980 a few months afterwards, or waiting to see what else is available at the time from AMD or from the new 20nm or 16nm architecture that both companies should have out by then. I'd rather stick to a single card setup, so I'd rather sell my 770 for a 980, and then sell the 980 for an 880 or whatever the new Nvidia card will be this time next year.
Cano' reacted to AngryGoldfish in GTX 970 vs GTX 980 Which Card Should You REALLY Be Looking At?
