So lets talk about this. You trade Amar'e and then what? How do you fix the turnovers? How do you fix the horrible PER defense? How do you fix the lack of a back up for Nash, if you are going for a PF then how do you get that backup for Shaq if you are replacing Amar'e who plays center when he is out how many PF's in this league can play PF and C and know what they are doing?
That depends. If your trading Amare to still make a run then you do so by trading for a player who plays better defense and rebounds.
In terms of turnovers, Amare is #15 in the NBA in turnovers at 135. I would say removing those goes along way on helping turnovers. Although it doesn't solve Nash's turnovers or Barnes for that matter it would be a start. Nash at least makes up for some with his high assist ratio.
I am not as concerned with backup for Nash because IMO Barbs has been doing a nice job. However, if you can get a backup as part of the Nash trade I would be for that.
Also, i would argue that Amare can't play Center either. If you look at his numbers and how bad this defense gets when Shaq is not on the floor, it's not like you could do much worse.
PS. Amare is only part of the problem. I at least don't believe that trading Amare is enough. I think Porter needs to go. I think Nash needs to go. Just my opinion. However, if I had to pick one player to trade to make a run it would be Amare first. My next choice would be Nash because I believe if we had a defensive minded guard, the defense would much bettter.
By far are two weakest defenders on this team are Nash and Amare. If you want to have a defensive minded team, you can't have either of those guys on your roster unless your team is STACKED with defense to protect them.