Probably. From what I've been reading, Bell is expected to get more goal line carries this year and Reggie Bush is supposed to take on more of a receiving RB role. I'm just not convinced that MJD will be able to play well in Oakland given his injury history and the competition with McFadden. I'm putting MJD on my do not draft list this year, but that's just my opinion.
If you can get Bell for MJD, do it. Bell is a low end #3 RB; MJD is a high end #4