I think Apple should license their OS one way or another. For American people, they don't care whether Apple dominate whole personal computer business or not. But for other parts of World, it doesn't make sense that they have to pay one US company for the OS AND the Computer. There're many PC vendors throughout the World. And most PC profit will be kept within their countries. But not so much if everyone has to buy Apple computer.
I think at least, Apple could start 'OS X Compatible' sticker program, so they can get some cut for clone PC and license their OS.