Dunn would bring more pitching in return than Griffey could on the trade market. And losing Griffey would hurt the offense more than losing Dunn right now anyway.
I know Dunn has the consistent OBP and will hit 40 homeruns every year, and he has many years of that level of performance ahead of him but... Time and again he doesn't produce in clutch game tying or game winning situations the way Griffey does. He doesn't hit strong pitching well the way Griffey can. He'll never have the rbi totals that elite power hitters produce. Let's face it. If the Reds are down 2 in the bottom of the ninth against a tough left handed closer (say Billy Wagner?) and Freel and Lopez are on 1st and 2nd. Would you feel more confident with Griffey or Dunn at the plate?