Will the Mac Pro Xeon Platform Ever Evolved?

For the CPU transition from PPC to Intel, Apple had to find a x86 CPU able to deliver a performance level equivalent to the PMG5 Quad 2.7GHz, if possible featuring at least 4 Cores, and faster than the default PC solutions.
Based on 4 Cores, with its 1333MHz FSB and 16GB supported RAM, the current Mac Pro was the proper answer, despite the fact it was limited to the FB-DIMM, a type of memory technologically more advanced than DDR2, but more expensive and with a slower bus.
But Intel did not intend to let AMD invade the desktop computer market, and pushed to develop a Core 2 Duo Conroe featuring 4 Cores. This week, Intel will unveil Core 2 Duo-dedicated motherboards with a higher FSB, from 1033MHz to 1333MHz, and supporting the DDR3, a memory with a faster access time and bus.
So today, while it is clear that Apple will soon unveil the 8 Cores Mac Pro powered by Xeon 5355, Intel seems to have preferentially invested in supporting a faster evolution for the Core 2 Duo desktop and mobile version rather than the corresponding Xeon/server version; simply for business/profit reason.
So one can question the future of the Xeon-based Mac Pro, if the accelerated development of desktop CPU brings them to a performance level equal if not superior to their server CPU brother? One way to prevent such problem could be lying in Leopard with an improved and more efficient multicore processing management system. But Intel is already planning 8 Cores Conroe/desktop CPU for end of 2007 beginning of 2008.