I think we are starting the funeral while the patient is still perfectly healthy.
I live in Hollywood and work in film biz. I am free lance so I work in many offices. NOBODY uses a PC in the places I go. This ended up being a big problem for one place I worked...they made web content for MSN but all of their machines were Macs. MSN was purposefully not "Mac Friendly" so they were having a hell of a time using the MS video player to view the content they produced.
The offices are full of Macs all over LA. SOme are laptops....secretaries usually have iMacs...but in the "Heavy Lifting" areas where the actual content is created that pays the bills...Mac Pros are the rule.
If Apple were to drop the Mac Pros they would become little more than a toy company. The cachet and "Cool" aspect that permeates these offices emanates from the Macs in every office and cubicle. If the edit suites were to switch to WIndows...the other machines would end up following. Apple knows this. They know alot of their "Cool" image comes from the Hollywood movie making image they have. If they stop making serious machines, they will stop being relevant in my biz and lose that clout.
The iPhones and iPods have brought Apple products into many pockets. Those people see and feel how nifty these little gizmos are and next time they buy a computer...SURPRISE...it's a Mac. So the gadgets are helping sell the original machines. WHy would they give up now? They finally are winning the battle. Mac users are no longer viewed as eccentrics who fly in the face of reason to be different.
I think they need to be careful with their word battles with Adobe over FLash and PS. Adobe apps also define the "serious" Mac......I routinely get ALL of my art files as Illustrator files.
LA is full of Apple stores and so is San Fran. These are not just centers of iPhone and iPod sales. Apple knows that being "cool" here and using their Product Placement division to appear in all the big movies and TV shows they can is paramount to keeping the brand taken seriously all over the planet.
Does GM make much of their overall money from the Corvette? Absolutely not...but it anchors the brand in many minds. Dad sits in the Corvette in the showroom and knows they can make a serious car, before he asks to test drive the more pedestrian vehicle he intends to buy.

should be WELL aware that their image of being THE content producing platform via their Pro line is an invaluable part of their brand. They aren't stupid, after all.