Is disappointment in the D600 driving up the price of used D700s?

I think people who waited for an affordable full frame camera were hoping for a step up from the D700 - not a D7000 with an FX sensor.

What are your thoughts?

Will Nikon come out with an FX that falls between the D700 and D800 or are we supposed to flick to the D600?

Could be. That happened to the Canon 40d after the 50d was released.