Yes, the 780 ti right now is not really bottlenecked by it's VRAM in most titles. I used to run BF4 ultra on my 670 2gb and it would max out at about 1900mb I thought I was ok until I read that the game used about 2000-2400mb on ultra. That's why I was getting frame dips. I lowered texture quality to high and it was fine. I'm just saying if you were to buy a card right now with the hopes of playing games on mostly high some ultra for the next two years buying one with 3gb of VRAM is probably not the best option. Sure, enthusiasts upgrade every single year and that's fair enough, but for the purpose of longevity you're going to want a card that can max out texture quality. Texture quality, is often one of the biggest determinants of overall picture quality in a game. I think along with antialiasing, it makes the biggest noticeable difference during gameplay. I would lower settings like shadow quality and ambient occlusion before I touched antialiasing or texture quality in most games.
The reason I recommended the 770 4gb is because the x70 is almost always best bang for buck, a factory overclocked 770 is essentially a slightly less powerful 780. I can guarantee it will still run games on good settings possibly even until the 900 series comes around. At a price point of $400 dollars, you could buy another for SLI pretty easily and crush a 780ti or you could just buy a 870 or 970 for $400 dollars when they come out.