i dont think single gpu is dead, look at 3dmark2001 my favourite game, so far its dominated by single card, and this is argueably the most skillful 3d bench...
i agree its hard to keep up if you want to be on top, but does anyone really need to be on top, alot of the hardest to get scores are the ones at the top of popular classes, 2900s, gts, gt, if you can get scores at the top of this range, these people can be proud of their achievements