I thought about upgrading to the D800, but realized that I absolutely loved the feel and performance of my D700. So, instead of upgrading, I bought a 2nd D700. I know these cameras well, and now I won't need to relearn a new camera. And for my purposes, they do everything I need them to do better than I need them to do it.
I think the D700s will be considered cult classics years from now - if they are not considered to be now.