I love my brand new D700. I plan to use it for many years. The manufacturers like to play these games to make us spend money but newer doesnt always equate to better.
I had two cars I bought brand new and got more than fourteen years out of each of them. Anything will work as long as you can get parts for it. The Jeep is still going strong and will take me anywhere I want to go the T-Bird not so much since I couldnt get parts and it wasnt good at all in snow, but it was a wonderful machine on the road.
I feel the same about my D700. Its rugged and will do anything I need and it will make my photography sheer pleasure.