Over the course of the last, oh, 30 years of near constant suck, the Raiders have had countless coaches (head and assistant) come and go, and moved twice.
Through all of it, the two constants have been Al Davis, and the aforementioned sucktitiude.
The problem is, you can't fire an owner.
Well, the league some years ago did take extraordinary action against Eddie DeBartolo, Jr., but that was after he was convicted in a corruption scandal. Even then, all the league did was suspend him from an active ownership role for a year.
But the prospect of anyone being able to force Al Davis to hand over the team to someone who can simply do a better job is dim.
But they've tried damn near everything else.