The question I have, about the Black Death scenario, is that I always thought that the main reason virus and work writers target Windows is the overwhelming market share and that from a technical perspective OS X is also vulnerable (though perhaps not to quite the same extent or in the same ways) should someone choose to target it. After all, Robert Morris's worm, one of the first I recall, went after *nix systems. I admit to not following Mac's as closely as I could and so if this perception is incorrect, please let me know.
What will Apple look like by 2010?