If i remember right, a similar project was made from Novalogic, with novaworld. All of their simulator were able to interact.
If i'm right.. was a big puff... :) Maybe the time wasn't ripe..
But now, i think it could be a interesting project to be pursued.
Of course, we have to have all of the ED's products compatible... Also with separate products.. With the DCS: A-10C stand alone, FC2 standalone, BS standalone and so on...
I think it coul be a great and rewarding project..
Scorpion