While Al Davis is in charge, they proably stay as a bad team.
However they need to upgrade offensive line and get decent receivers, only thing they have in passing game, is a decent tight end. There ok at running back but I do have concerns over McFadden when it comes to him possible being injury prone.
There defence is inconsistent but does have potential to bring a lot of heat on opposing quarterbacks, just see the game vs Eagles for prove. They have one of the best cornerbacks in the NFL (Asomugha). There defence is not great but its respectable, they just need to be more consistent.
Its the offence thats the problem, no QB will have success with a poor receiving core. Oakland Raiders is one of the poorest in the NFL, thats the main issue and also at QB. New receivers, new qb , some new blood on the offensive and defensive line. Then raiders be a much better team, although I do have big question marks over the quality of coaches they have.