It's not that simple anymore though. When he said that in 1997 or 1998, it seemed to be true. But what is "the desktop"? That definition is changing.
I have a Mac Pro, with a 27" monitor. If you asked me in late 2009 whether that would remain my main desktop, I would have replied; Hell. Yeah! But no longer. Most of my daily computer use has been with an iPad. My friends who have bought one, an increasing number, have been finding that it does indeed grow on you, and that you spend more hours with it over time.
Most of those people own Windows machines. Though, that's changing as well.
It's very possible that we'll find iOS as the next major "desktop". In fact, I believe that it's already happening.
With estimates that tablet sales will exceed 375 million in 2016, the desktop will no longer be considered to be a Windows world. If the Surface doesn't have rapid and broad adoption, it will be out of the picture.
If only it was that simple:
1. The iPad is nowhere near powerful enough to replace the Mac unless all you use it for is simple tasks. Maybe one day but not anytime soon.
2. Tim Cook said only a few weeks ago at the AllThingsD conference that Apple had no plans to merge OSX and iOS or replace OSX with iOS.
As I said the Windows/Mac battle is over. They have reached a status quo that satisfies both parties.
Apple has re-invented itself and built a new OS for a new mobile world. That is the battle now. Looking backwards to the Windows battle would be a big mistake
Essentially Apple is now a mobile phone & consumer entertainment devices company that also make computers. Sorry if that hurts but it's the truth.