Sony and MS done goofed for not going with high end cards... Unless of course PS4 and xbox one have like a 3-4 year life cycle. It would make perfect sense considering Sony went for x86 architecture most likely for backwards compatibility.
Its a good thing nobody buys consoles specifically for the highest end graphics or performance in general, or PS3 and 360 would have been dead 2 years after they launched.
With die shrinks(slim revisions), price cuts and exclusive games, i think they can be competitive and hold on for the average 5 to 6 year cycle.
If there is a next gen after that, by the time it rolls around, newer architectures, better processes and better technologies like this RAM breakthrough will be in a mature stage...and the absolute high end today will be the low end budget option very viable for a console.
I like to think of it like, the smaller the upgrade was from 7th gen to 8th gen, the bigger the upgrade from 8th to 9th.