Ahhh, Steve. If only you were around to see this.
Twenty-five years ago Microsoft copied the Mac interface and confined Macintosh to a tiny sliver of the PC market. Despite all the progress you've made since then, Macintosh continues to command under 10% of the worldwide PC market. But now, at long last, Windows is vulnerable to a potential knockout. If the Windows 8 transition is as uncomfortable as I expect, you might be able to peel away large numbers of PC users and trigger a collapse of Windows sales.
You'd have to make some compromises, creating special Mac bundles with Windows emulators and file migration tools. And you'd have to jump back into doing Mac vs. PC advertising, this time welcoming the guy with the dorky jacket into your club. It's risky, and in some ways it's backward-looking at a time when Apple is looking forward to conquering television and maybe the auto market. But the PC market is worth about $300 billion in revenue a year, at a time when it's becoming harder to maintain Apple's sales growth. Where else can you so easily tap into that big a pool of revenue? Besides, how cool would it be to finally be the leading PC platform in the world again, after all those years? Talk about changing the world...
If Steve were here, I think he'd be sorely tempted to attack. I don't know what Apple's new management will do. But somebody in Redmond ought to be really scared of the possibility.