The Eagles are generally considered to have the best starting defensive backfield in the NFL. Three of the four are Pro Bowlers and CB Sheldon Brown may make it one of these years too. Only free safety Brian Dawkins is older than 27. At almost 33 he is probably nearing the end of his starting career which might open a spot for Considine or Fox down the road.
Right now the Eagles have just three white starters out of 22. Two of them are o-linemen, and one of them, Todd Heremanns, could lose his position to a black. Hopefully Fox will get some playing time, but Andy Reid isn't about to be a Caste-buster.