I hate to say it but I think the Mac Pro is no longer the Flagship of the Apple Line, that honor has fallen to the MacBOOK Pro...
Honestly, look at Apple's most recent strategies, mobility is king in the new Apple World.
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Not just the Apple world, but the computing world in general. I remember reading not long ago that laptops have already taken or are very close to taking over sales when it comes to computers. Only makes sense that that is where Apple will focus their efforts from now on.
The Mac Pro was never going to be the biggest seller. It is a true pro machine which by definition is a much smaller market. It was never meant to compete sales-wise with the consumer laptop market which is much larger.
However it is still the flagship machine for Apple. It is their best offering in terms of pure computing power and is the only platform that is a true pro video authoring, 3D modeling workstation, scientific workstation, and software development platform.
If the Mac Pro model dies on the Apple vine, so too does high-end scientific, graphics, video, and future innovative software for the entire OS.
The Mac Pro is still an elegant beauty with plenty of muscle. The current octo runs like a beast under Leopard. People just complain too much. Frankly there is very little that can't be done with the current Mac Pro.
What is does need is more mature software, more video card offerings, and more peripheral offerings such as Blu-Ray / HD-DVD authoring devices.