Well, what is your POD?
First, as long as Apple doesn't let other company sell computers with it's OS, it is imho a wishful thinking to have them take the place of windows.
And even if apple manage to take a large market share, it will then suffer from anti-trust policy. Why do you think Microsoft gave so much to Apple in 1995? And they even sent some of their engineers to help Apple.
Moreover, having Apple dominate the 90s will just make the adoption of Linux by companies faster and even more widespread, as the core architecture is similar, and one is free, while the other...
Finally, when do they dominate? If it is before 1995, Steve Job might not be called back as he had been. This will lead to massive butterfly: no Steve Jobs at Apple might lead to no Ipod, and thus no Iphone. The smartphones will likely be completely different from OTL. I find it even less likely to see Apple dominate post-1995. And then, will Steve Jobs have any incentive to create the Ipod/Iphone?