If the 5800 doesn't arrive in any capacity, it seems to me that nVidia is giving up to ATI for this product cycle, in the high-end. I still think the NV31 and NV34, however, are very strong products, and nVidia would do very well to mass produce these (this is, after all, where the real money is).
"Physics is like sex. Sure, it may give some practical results, but that's not why we do it." - Richard P. Feynman