You know, I use my D700 for non-action shots. Got a D300s which I use for movers and telephoto work.
I could really use those 36mp in my 'telephoto' camera to try and resolve more detail and to let me crop in harder when I've run out of reach with distant subjects.
For sure, the 300s does very well, but it could stand improvement and the D7000s' 18mp isn't enough extra (and it's not got CAM 3500 anyway) to make it a viable replacement.
On the FX front, I don't find the D700 lacking in any way at all. I'm not saying the 800 isn't better- for sure it must be. Just not sure if I could put the 800s improved specs to work in a way that would cause my D700 'work' to improve.
In my case, a 24 mp or better, pro quality DX cam like an upgraded D300s would genuinely be a lot more useful.