No. No. And No.
As a GTX 780 user, and former GTX 670 (2GB version) (got both when they were the top of the line for what I could afford, and yes I've had AMD many times in the past), you are seriously blowing the VRAM issue out of proportion.
I'm currently on 1440p. Not 1080p, not 720p, But 1440p.
I can flat out tell you there are 3 games for me that have come close to or passed 2GB of VRAM. Sleeping Dogs, Crysis 3, and Skyrim (with close to 22 mods, including 4K textures, etc).
Sleeping Dogs passed the 2GB VRAM limit. Crysis 3 came in at ~1.85GB of VRAM usage for me, and Skyrim comes out at 1.7GB.
You want to know why? Because the higher resolution you go, the less AA is required to remove jaggies when playing 3D games. Super high AA is 1000% unnecessary the higher resolution you go. Its taking a performance and VRAM hit for an extremely, and I mean EXTREMELY, small graphics upgrade. Chances are, you won't even notice it.
95% of the games I own (around 130 on Steam at the current time of this post) use less than 1.5GB of VRAM, and most far less. And that's at 1440p.
Please just stop spouting that VRAM is an issue even at 2GB. Its not. Maybe if you were going 4K. Heck, people are more than capable of running triple 1440p monitors with a 3GB 7970. Think about that for a second. That's a higher pixel count than 4K by a considerable margin.
I've stated this before. You are ALWAYS most likely to run out of pure GPU grunt power before you even come close to hitting VRAM limits.
There is absolutely no reason to fanboy one side or the other.
Both the GTX 770 and the HD 7970 are fantastic cards and both are pretty much damn near equal. Maybe you should read my other post in this thread.
Edited by Kinaesthetic - 6/19/13 at 12:41pm