As much has Gore has meant to us I think Hunter, James, etc can replace him. Sopoaga has been as good as (probably even better than) Franklin and I would expect that RJF or Ian Williams could replace him. Still think if we can get him resigned he could go 3-4+ more years though. Goodwin to me is average and if we don't feel comfortable with Kilgore, Slowey, Beeler we can use a high draft pick and easily replace him. The main thing is mental for young centers and learning the calls and adjustments. Those guys can match him physically. Rogers will be tough to replace but again that's 3 or so years away. I think Culliver and Brown can do that but we might pick up another CB in the draft early. Anyways, any answer besides Justin Smith is wrong. We might be able to plug a good DE in there but none will be able to match what Justin brings. He's brings as much if not more to this defense than Patrick Willis and any other player on this team.
I would rank them...
Still not too worried because I think Justin has at least 3 years left... Sopoaga 3-4+ if we re-sign him, Rogers 3 years, Gore has like 1-2 but James/Hunter are ready to replace, Goodwin will be replaced after this year.
Edit: Another guy is David Akers. He has to years left and will be 39 by then. If he is still doing well and we want him back I am sure he would sign for a 1-2 more years to end his career. Between him and Nedney I can't go back to crappy kickers.
[ Edited by Gore_21 on May 24, 2012 at 10:14:23 ]