cschalle wrote:
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...I am well aware of this, I meet or call with a lot of these customers on a regular 
basis. And I also spend time working with them to prepare their transition to
GNOME 3 as part of their RHEL 7 transition.

...I am generally negative to any such solutions as they tend to suck resources away from advancing something over to trying to keep multiple options sorta working together...
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As a long time former Mac user I can tell you that Apple has had retained the same desktop design from it's early days and has continued to develop and refine it over decades. In fact Apple has launched a new MacPro specifically for workstation users to use on their traditional desktop Mac OS showing they're committed to the traditional desktop metaphor and see a bright future ahead. Just because Apple launched iOS on the iPhone and iPad didn't mean it totally abandoned Mac OS and decided to force it's MacBook, iMac and MacPro customers to use iOS. They keep both interfaces separated as two different products in parallel.  Both have the same core and regularly share innovations in a very healthy innovation cycle.

Why can't Gnome, Fedora and Red Hat do the same?

Unfortunately what Ubuntu, Fedora and others have done defies commercial logic.  They think that "being like Apple" means pursuing innovation no matter the cost even to the point of being reckless.  As a result abandoning Gnome 2 was single biggest business mistake the commercial Linux distributions made and has cost them the equivalent of billions of dollars in growth and market-share.  

The point is Gnome 2 can sync in parallel with Gnome 3 and the restrictions and policies in place are purely artificial and it hurts the business.

Apple kept it's traditional desktop product and is actually expanding it's Unix workstation user-base by catering to the traditional desktop workstation user. 

Mac OS is what the Linux desktops should have been, a stable traditional desktop metaphor that's supported and maintained for decades.

Microsoft is suffering because it made this decision.  They attempted to force their workstation users to adopt a mobile oriented interface in Windows 8, the hated Metro interface.  Now third parties are selling Start Menu replacements.  In a major updated planned for post-Windows-8.1 Microsoft will enable "boot to desktop" mode so users can go directly to the desktop and bypass the Metro interface.

It's very simple, Gnome as a single product with two different interfaces Gnome 2 (Mate) and Gnome 3 (Gnome Shell) relying on the same modern core infrastructure as well as a collection of default applications and toolkits. The combined communities of MATE and Gnome Shell would be a force in the open source world.  They could easily unify the Linux desktop space and provide a single coherent product.

In the end you have to drive Red Hat subscription revenues.  You are accountable to Red Hat shareholders. To that end you have to follow the leaders in the high-end workstation space Apple and Microsoft and match their traditional desktop products, avoid their mistakes and exceed expectations.