I think in a nutshell, a lot of us concurred that the forum as currently constituted would encompass a lot of the same people -- not that it was just about two different cameras. D700 owners will naturally be interested in the D800 until they either decide it is a totally different camera or another member of the same family. Then like the the D1-D2-D3 and D100-D200-D300 operators, who sort their own interests from those forums, people will focus on D700 or D800 -- or both subjects in this forum. Discussions may lead you one way or 'tother.
My membership of the site is due for renewal, with the demise of the D700 forum I may not bother. No great loss I am only a silver member (because living on an Island in the middle of the sea) I cannot take advantage of many things eg workshops and offers. It seems at times that all that matters is the next model, we are not all rich, my D700 and 70-200 VR have to last a little longer yet. Its no longer worth watching the daily messages fron Nikonians all I see under D700 is 'D800' no matter how you dress it up they are not the same - press delete withot looking when I used to look forward to the input.
One every member is important so just silver doesn't make you less important than gold. As far the forum once the initial several months of oohh and ahh D800 posts things will settle. I'm in the same boat no real plans to upgrade with the exception of adding a second D700 sometime later this year. Hang in there I've been thinking as a D700 owner I need to start a few D700 threads.
The D 700 is continuing in production so stay connected! That news may surprise many who thought the D800 had knocked it on the head. Price trends will be interesting now that the D700 is not wholly "obsolete". Presumably it will be quite a while before D800 members overtake D700 members and in any event some D800 purchasers will hang on to their D700. Plenty of life for D700 in this forum!
With the increase in availability of good discounted D700's there will be a lot of people like myself who upgrade to full frame. Obviously they will migrate to this forum for info, guidance. Please don't bail on us. We need your help! jim