If what Apple provides as a hardware platform is interesting to the open-source community, it would not surprise me very much that a group of people will find a way to port Linux to that hardware in short order.
Linux is at the starting gate. Shipment numbers look good, but on the revenue side you see a clearer picture of its enterprise value.
Linux is seen by many to have a strong opportunity in the embedded operating environments market.
At this point, the perception is that Linux is viable (only) for servers.
We are starting to see the growth of companion devices that sit side-by-side with the desktop systems. It is looking more likely that this is where Linux will find a place.