My distaste for Dells aside, there is a MIDDLE GROUND between the two extremes:
* Apple keeping OS X to themselves, running only on Macs--as currently we expect. (Rebranding Apple Macs--if a company like HP ever did so--still falls under "keeping it to themselves" in my book. The HP iPod is no different after all--still in Apple's control, and all sales are still Apple sales.)
Vs.
* Apple selling it to anyone with an Intel PC--which could make a lot of software money, but would make OS X's complexity and support costs skyrocket (probably reducing quality)... and remove the benefits of hardware and OS designed together... and potentially take away from Apple's own hardware business (unless the Mac market grew to compensate--an interesting gamble).
What's the middle ground?
Apple doesn't sell OS X to PC owners. They don't sell it OEM to just any old PC makers either.
But they sell it to one (or a few) selected partners, and have a big say in the hardware specs. Thus, OS X doesn't become more complex to maintain and support, AND the Pandora's Box of OS X on any old PC stays firmly closed. Yet there are now two or three sources of OS X machines, rather than one. Apple lets go of SOME control, in a strategic way.
I can see that happening some time, if the time is right and partnerships can be found that would deal with Apple's concerns.
Maybe Dell, maybe not--but I can see one day there being some "generic PC" Macs out there, costing just slightly less--or maybe being only on the LOW end of the Mac lineup.
It might not be a bad thing for Apple, if done in a controlled way with select partners only.
I'm not saying it will be a good thing either--the timing would have to be right in the market--but I can see it happening and not being the end of the world.