Why? Starhawk was basically warhawk's sequel.
Warhawk has a better reputation... SH's active users base is already below Warhawk 2009(just the ranked servers). Two years after release Warhawk was doing better....
The Starhawk name will be severely hurt by how Sony forced it out the door early and then pulled the plug after a few months(from what Pete said 1.4 sounds like the last major patch). Not to mention the network is not as well made(but this probably has more to do with the PSN's overall network quality decline Warhawk nowdays is just as bad as Starhawk).