I'm guessing there's a bit of source bias here. I'll buy that Windows won't be dominant in 10 years, but defaulting to Apple doesn't seem backed by the data presented.
Apple won't dominate the corporate space because then they would have to support the corporate space. They know if they do that their products will be common, and they couldn't charge the premium they do. Then the people that demand corporate support their Apple products wouldn't be rebels sticking it to The Man. Would doctors and C-Level wannabes really feel special if they didn't have to throw their weight around to get IT to accept Macs? If that common, dirty, IT troll just sauntered up from the basement with a fully supported Macbook Air ready to go, it would take all the "I feel SPECIAL" out of the experience. And that is what Mac users pay for.
Not necessarily Apple being dominant, but the only thing that you need is a Web browser and no one will give a shit what you run that on, Windows, Mac, Linux, ChromeOS