Reason's Why It Wouldn't:
-OSX doesn't natively lend itself to resolution independent zooming.
-Application Controls on the menu bar are frozen to the top of the
desktop
-Dock is frozen to the bottom with its special effects
-Access of most OSX controls is around a static, non-changing desktop.
How they could overcome this?:
-Create a static menu bar. This would mean that the menu bar would remain where it is as you zoom in and out and around the desktop, ensuring that the controls for separate applications are always available.
-Static Dock as well? My making the dock a static element but still allowing zooming on the desktop itself, you would still have functionality.
What does this mean?
It essentially describes a more dynamic and less rigid form of space, which provides a large desktop separated into x number of regions all centered around a static menu-bar and dock. Perhaps Space 2.0 or Expose Zoom?
This is how I would see it implemented, but again this is my Opinion.
-Josh
