Err, think your loosing grip on reality here. I haven't edited my posts, so go ahead and quote my post where I stated "14-15gb available for vram". You don't find it, as I didn't say it.
I said "On another note, are you aware of specs of current gen consoles? They have 8GB of shared memory, that can be used for both graphics and system. As consoles are so well optimised, the system/OS doesn't use that much, and the majority can be dedicated to the GPU as VRAM. The next gen of consoles have 16GB of shared memory..."
You plucked 14-15gb out of nowhere, while I simply said the majority can be dedicated to VRAM. 6 out of 10 is a majority.... 9 out of 10 is also a majority, though a better description would be 'vast' majority. Your "15gb" number would mean the new consoles could use 93.75% of their shared memory as VRAM. Please don't try and insinuate that I suggested this. Anyways I'll stop now since it feels like I'm a school teacher
My main point is that console total memory is doubling. Consoles can use the majority of their shared 16GB of memory as VRAM - so VRAM allocation in AAA takes will very likely explode over the next year, rendering 8GB cards obsolete.