Also I don't think a consumer tower will help Apple take any market share anyways. People are switching to mobile devices in droves, desktops are going to be a niche market. If apple wanted to increase market share it would be to make a cheaper macbook.
Unfortunatly very true...
Look at these trends for
the most populars mac computer systems
Now the same trends with those of
Apple's mobile devices
Apple's computer systems simply disappear in the masses of searches made for their iPhone and iPad. Those mobile devices have become, in a couples of years, the main source of profit for the company.
That's not to say that Apple computers are going to disappear right away, but I think we might see a consolidation...
All laptops will converge to the Air form factor, a sleek computer that can only be extended through the Thunderbolt port (difficult upgrade of RAM and SSD).
The iMac remains a great desktop computer, with a limited lifetime (due to the GPU) that suits most consumer, I don't see this line changing much except to abandon hard disk in favor of SSD for internal storage.
The mac mini will see a consolidation once the enclosure can accept a 4-core processor AND a GPU, probably abandoning the dual-disk option for a full SSD internal storage, since all macs can get mass storage options in Thunderbolt (or USB 3) or through a cloud.
The mac Pro is the real issue...
As a server it doesn't make much sense, real server people are probably more apt at configuring linux stations, and for small server a mini with Thunderbolt peripherals can probably do most jobs efficiently.
As a workstation it suffers from the fact that even Intel releases its workstation CPU with technologies from the previous consumer CPU generation, but also from the fact that both AMD and Nvidia GPU offering for Apple's workstation is very limited.
Unless Apple does something bold (like developing their own GPU offering), there aren't a lot of reasons, beside some Apple owned softwares, to keep using Apple workstations.
I guess an answer will come soon. Personally, since Apple took the time to push forward Final Cut X, and Apple computers are still needed to develop iOS apps, I still believe there is hope for the Pro line, or other computers as long as their lines are consolidated (one simple offering with built to order options).