Not happening.
The Xserve was discontinued because no one gave a crap.
No. There was a small community that cared. The primary problems was that it was small and that computers get alot better every couple of product cycles.
whilst I'm sure very functional and powerful, have the disadvantages of not being scalable and being limited to one platform.. nay, one machine (for serious purposes).
The Mac pro only has 4 slots for PCI-e and RAM. It is the only "shove cards and disk" model in Apple's line up. There is no mid-tower. There is no mini-tower. No HTPC sized box where can put in your own card. ...... So as far as being "limited" it is in pretty much the very same boat as the XServe. So this really boils down to is it selling enough in number.
As of speaking Apple have two choices for OS X Server, either licence it out, or kill it, because right now it has no purpose for being.
Utter nonsense. "OS X Server" has always largely been a set of applications on top of the mainstream OS. Beyond some minor tweaks to the kernel parameters that were already present there is not really special or highly optimized about the OS core for the server model. They (just like most other software and system vendors) just charged megabucks for the "Server" version because they could.
For many small businesses and departmental groups Mac OS X Server is just fine. Where the local support person is doing Mac OS X anyway and isn't predisposed to Windows and/or Linux, it is a pretty good fit.
Given that the number of Mac OS X Server deployments shot up once the Mini Server bundle arrived, Apple is doing exactly the opposite of killing off X Server. OS X Server is
growing. It does not have a "nobody is buying it problem".
Hell even if they only sell 10,000 a year (made up number before anyone quotes me), those 10,000 machines are enabling the development of applications that bring in billions in Mac sales, and billions in iPhone and iPad sales.
Two fundamental flaws in this hand waving.
First, a recent rumors article came out with estimate that Apple is on track to sell 5 million Macs in a quarter. Being a bit conservative at 4.5M/quarter that's 18M/yr. 10K/18M ==> 0.0005 In other words, sell less than 0.1%. Fall out of the single digit percentage points and it is likely a dead product. An order of magnitude below that and it is not even a question. Even if Mac Pros are selling at 100K/yr they are on slippery slope. The minimal amount to avoid the death watch list is going up every year. The argument of selling into a stagnant market is flawed.
Second, you don't need a Mac Pro to compile a couple million line program. Using build farms is a simple way to get around the "compile everything from scratch takes a long time" problem. Indeed, there is already an Apple tool for that.
http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man1/distcc.1
Furthermore, almost no developers need to commonly do that. If tweaking a some functionality commonly requires the
whole program be recompiled there is something majority flawed with the code. Developers spend a large amount of time staring and typing at the editing and debug screens. You don't need a supercomputer to accomplish those tasks. Likewise, recompiling a library module shouldn't require 16GB of memory to resolve the linkage. Sure, there should be some "build from scratch" integration builds to be done periodically, but there is no necessity it has to be in a single box.
Compiling software is one of those "embarrassingly parallel" class of problems. It is not hard to use multiple machines. If the Mac Pro didn't exist those who stand to make "Billions" in Mac Software sales will simply just buy multiple of the less costly machines and continue to make money.
It is a nice to have a cluster in a single box. It is not necessary to have a cluster in a single box.
$1099 Mini 2.7GHz Dual i7 with 8GB Apple RAM
x3 as compute nodes and a $999 min server as cluster file server: $4,296.
$3,924 Mac Pro Quad 2.8 with 24GB Apple RAM and two 1TB drives.
While higher priced, the mini cluster actually has 2 more "compute" cores (and two more file server cores). That's just the current mini. An affordable, faster cluster interconnect would make it even better. Likewise, each future node going to 4 cores even if the Mac Pro goes to a nominal 6. Even if the cluster is marginally slower and $300 more expensive... if that is gap between making $100-1,000K or not ... most businesses are going to pull the trigger.
The market for some apps that require non-mainstream video cards might dry up, (high end AutoCAD), but the vast majority of Mac Apps are generating money because they are being sold to that greater than 98% of folks who do
not have Mac Pros. That's where the money is. Selling to
those people who
are buying significant numbers of Macs. Not in kowtowing to the groups that are not buying Macs. That is just backwards.
The Mac Pro doesn't need to outsell the other Mac categories, but it does need to keep up in terms of growth. If the growth dies for an extended period of time ( and falls into the very low single digits , or less, of the Mac product mix), then the product will probably be removed. Great products don't have negative growth. Apple is about making great products for people who find value in those products.
The Xeon E5's should add some value back into the Mac Pro feature set. Growth will probably pick up again once they are released. But it would not be surprising that it is on "death watch" by the folks who track numbers. If that growth doesn't show up there is no "get out of jail free" card here. Nor is there a "steal from Peter to pay Paul" card either ( eat into iMac sales to boost Mac Pro sales).