I didn't say it was VRAM specifically. I said it's ineffective management of VRAM. The game is terrible at managing VRAM, hence why you still get stuttering on cards with 6GB of VRAM..Why makes you so certain it's VRAM that's causing the stutter?
The onus for this is totally on Ubisoft, and not on PC gamers to upgrade their video cards to higher capacity models..
It remains to be seen whether AC Unity will follow suit. AC Unity uses an updated version of the older AnvilNext engine, so it may escape the issues plaguing Watch Dogs..