Go ahead fool, your the one disillusioned enough to actually think a new coach can help Roddick
Every coach has helped Roddick enter the finals at least once. Roddick also has been to more Grand Slam finals the past years than anyone on tour besides Rafa and Fed.
I'd like to know who the heck you'd root for, and if it's anyone besides Nadal or Federer, I'd probably spit my water out laughing. And if it Rafa or Federer... well.. no one likes a Rafatroll or a Fedtroll.