That's what the n00bs think as someone who owns a GTX 960 2GB and I actually game at 1200p, 2GB is more than enough for the majority of games. AA would cripple the fps so forget about vram concerns.
Single powerful GPU is nearly always the best seeing as most games devs are lazy and don't support SLI fully. Also, less heat/cables/room in the case for other PCI cards. I wish the whole VRAM scaremongering would stop, it seemed to start in 2011 or so it was barely talked about before that. "The new BattleField will need 4GB of ram pew pew" TTL tests a card with 2GB and it plays it fine still maxed out.
I remember the main mistake back in the day was confusing cards like a 9500 GT 1GB and a 9800 GT 1GB, people would just see the 1GB and wouldn't know what the real difference was and how much faster the 9800 was. 9500 GT 1GB was a horribly crippled and pointless card.