The link below has some rational thoughts about how to fix this team. I don't think a new guy as a coach of a veteran team is a good idea, but there are worse ideas, like hiring Eddie Johnson or Dan Majerle.
Other thoughts....Who has trade value on the team? Do you trade Diaw or Barbosa? Lose versatility or lose three point shooting and speed? I think Diaw is more valuable, but if we need three point shooting, then getting rid of Barbosa won't help. Should we keep Giricek. I'm really just filling in space to meet the minimum word requirement.