Usually a good center will be a safety valve on the fast break and after the outlet go to the high post on offense. He will be open for a jumper if the transition game fails and has a headstart back on the defensive end being at the high post. This is especially true on the Flex offense. I know some teams run the Flex like the Jazz.
Even in that instance, how many times is your most efficient offense having your center take open jumpers? That works great if you've got Mehmet Okur as your center, but it's not the case with most guys.
I'm fine with having a center who plays good defense and who grabs rebounds. That's the most effective way to start a fast break in my mind. It's the guards and wings who should be out finishing the break; very few teams have the luxury of having a center who is fast / athletic enough to consistently being the one finishing on the other end.
I think a lot of fans are expecting too much scoring from the center position. Here are the leading scorers among "traditional" centers last season:
D. Howard - 22.9 points
B. Lopez - 20.4 points
A. Bogut - 12.8 points
R. Hibbert - 12.7 points
C. Kaman - 12.4 points
M. Gasol - 11.7 points
J. Noah - 11.7 points
A. Bynum - 11.3 points
E. Okafor - 10.3 points
M. Gortat - 10.2 points
T. Chandler - 10.1 points
Which one of these guys is running and finishing fast breaks, or is hitting open jumpers from the high post? A handful do one or the other, perhaps, but most of these guys aren't going to be all that effective as break finishers.