Here's how I see the team in five years, assuming no external additions are made (not going to happen! lol)...
gone - Holmstrom, 37, Draper, 39, Bertuzzi, 35, Maltby, 37, May, 38, Williams, 29.
gone - Lidstrom, 40, Rafalski, 36, Lilja, 34, Meech, 26, Lebda, 28.
gone - Osgood, 37.
In terms of forwards I think you're underestimating Mursak. He's got Helm's speed, or at least very close to his speed and good hands. I'm assuming he's going to be able to pot about 30 goals next season with the Griffins. I also think Andersson could take over the 3rd line center spot in a few years. His point production isn't the best but he's all over the ice and plays very physical. I don't think Ritola, Miller or Emmerton will be part of the team, and Ferraro's future is in his own hands. If he wants to be good he can.
On defense that seems about right. I don't know if Kindl has top 4 potential, but that remains to be seen. He apparently plays much better when he's with better players (sounds obvious) because he runs on mostly instinct. I also think that Pyett or Lashoff might be there in place of Fournier or Nicastro.
The goalies seem right, but I have an odd feeling that Jimmy is going to command some serious cash next off-season unless he hits the sophomore slump this year.