Could all be a lot of FUD
This is the sort of position that WS would think was important. The haters have tired of repeating the normal mantra that Steve is sick, so now this. Whatever. In the old days, the mantra was that Apple was 'going out of business'. That one worked for a long time, not so good now though...
Get a grip, people. So what if he does leave? He's done a good job, but just like Steve Jobs, he can be replaced, Apple has an enormous lead (wether you like it or not) and a clear road ahead. Just keep making really well designed products that work great and most people (probably not the PC nerds here on this board) love.