If we move (I'm firmly in the redevelop current ground opinion), but if we really do have to move then I think brown-belt land in the top of Neepsend / Parkwood Springs is the place to go.
Not only is it closer to town, its next door to the lively Neepsend and Kelham pub scene, and it's also on the same main road and tram line we currently have.
But most importantly it's still close to Hillsborough - probably only 10 minutes more to walk from Hillsborough Corner than it is to walk to the ground now - so we can keep the community we have in S6 going whilst also absorbing a good chunk of town as we move closer.