I do think it was a bit pointless to go out on the limb he did
now, but I don't think the limb is as shaky as you make it out to be...I just think we have a bit of climbing on the tree left to do to reach it.
My pet theory, which I've mentioned here somewhere before, is that we were heading to the point where the GPU paradigm would shift to more CPU like...except, how much further do we have to go? Yes, there are many theoretical achievements left to accomplish, but we seem to be getting greatly diminishing returns in terms of noticeable visual improvement.
All of the cards intended to be released this year, taken collectively, seem, to me, to have reached a level of display such that it will be hard to find an effect that can be significantly (atleast from the user's viewpoint) improved by future hardware. Until we move beyond a 21 inch 1600x1200 display (which, I suppose we could, but why would we in the next decade? That would just be cumbersome...I think we'll just be focusing on LCD-alike development) what evolutionary breakthroughs beyond a P10 type card that is able to match the features of the other cards planned for release do we have left?
Combined with the very noticeable delay in the ability of software developers to take advantage of new features in cards, I think graphics card manufacturers will be forced (nVidia, and possibly ATi if their chip licensing is as profitable as it is for nVidia) and perhaps eager (everyone else) to embrace this shift.
I mean, how long have we had the Athlon, with the only real change being higher clock speeds and manufacturing improvements to lower costs? GPUs shifting to that type of model of development seems feasible "soon" (an ambiguous term depending on whether companies are able to execute), and that would fit the author's vision, atleast as I interpreted it.
Then again, Longhorn might open up an entirely new avenue of improvements...though I can't envision it being more demanding than 3D acceleration, since parallelism is already a design goal, I could be wrong.
Atleast, this is my admittedly uninformed opinion.