Sure, no one's saying Jobs will be forgotten to the sands of time any time soon. Yet 1000 years is a little bit of a stretch, especially when you try to size him up next to the ancient greats.
Lots of differences: for a start, much more will be remembered of our times than is remembered from 1000 years ago. Historians in the future will be trying to determine what is important from too much data.
So you'd expect that someone who rises in the general consciousness now to actually be far more impactful than the 'ancient greats'.
A better analog to Jobs than the ancient Greeks might Michelangelo, and we still talk about him, because what he did for that time was incredible. In fact it's still incredible. Jobs didn't just build amazing products for our time, but amazing products for the future as well. We didn't just fall in love with his products, we fell in love with him and Apple as well. [And FYI, I'm not a fanboy!]
This must be the first entrepreneur/capitalist/CEO that has been mourned on such a global scale, and that in itself is remarkable; there's no one who comes close. Maybe Warren Buffett, but outside of the US he's not that well-known. The only person I can think of from modern times might be Walt Disney, someone who was similarly creative, demanding, and left a cultural and commercial legacy behind.
The problem with that analogy is Michelangelo's work actually survived all that time, the iPhone etc's will be replaced by something from Apple or another company, and the devices will get tossed and forgotten just like all the other generations of technical devices that preceded it.
