Not a bottleneck. It can help a lot with loading textures or adding some AA without draining the GPU of its memory pool.Is having 32MB of edram, rumored in the WiiU, a bottleneck, or does it not have any bearing to the size of the texture?
All I know is, having played Mass Effect 2 on PC with the texture mod of 4096x4096 for faces and 1024x1024 for bodies it is crisp and clear at1080p, even more so at 720p. No need for 8k textures in consoles. I would be happy with 2k for faces and 1k for bodies instead of the 512x512 and 256x256 used this gen.