There has been discussion threads about this before, and even though I will not write a bible of why it wouldn't be a good thing to make a campaign I will keep it shortsiessss.
A campaigns charm is short, and it will be even shorter if there's just a few people working on it. Once you have played it, it will be the same story over again, so there's not too much reason for you to go back. In a multiplayer mode the players make the game in this case. FH is pretty much a sandbox game in it's own way.
Lets say if kov and other users that's there to help him will spend months to throw together a campaign, a campaign that might not even be all that great just for the sake of it, then I rather see the work going down on fixing the multiplayer and game stability in general, getting more maps, actions, functions, prey. You know, fun stuff. Instead of a campaign the majority will not go back to.
Ofcourse if for some reason kov would want to make this nothing would stop him. But I personally do not see the point of one in the close future.