I'm not sure if someone else has suggested this, I didn't find anything in the search. It would be a good idea to have, nothing too fancy. It is possible to do it, I know someone has done it in simple planes. I know simulating all the parts would be very hard for servers, perhaps the way to do it is to make parts act like one. It may ruin the simulation aspect, but if it means I can fly airplanes with friends decently then I'd say do it.
That's a shame, would really like to even have at least a little bit to have a sort of airshow. Or just enjoy a game with my friends or something, anyway I do hope they change their mind one day :)