We might soon be able to do campaign coops quote from Pat Wilson
That is in development right now. PWCG currently supports coop with one squadron. Unfortunately PWCG is a desktop application, so users other than the host have no UI. They can only fly the missions.
First step (in progress) is to create a web based code that the host can run. Players in the campaign will be able to access the servers on the hosts machine and interact with it to see the campaign in a view that will replicate the information available in the PWCG desktop app.
After that comes the more challenging part: extending PWCG coop capability such that any number of players can play for any side. In 5.0 PWCG added the ability to handle ore than one human player, so that is already out there. That concept has to be extended to human players in any squadron. Some of the uses are obvious: a continuous campaign being played by multiple users. It is not MMO - participation will be controlled by the host. But once this is in place a group of fliers will be able to play either side. Squads can use PWCG for online wars. I'm sure that there will be any number of uses.