I don't think I'd mind a world without us. If currently existing humans could get some sort of trade in where they can plop their soul i nto another body, I'd be a wolf. And being a wolf in a world without humans sounds awesome. None of that ecological damage and stuff like that. Plus, I would be a wolf... Wolfy wolf wolf. (I like wolves. They are the only canid species that doesn't scare the crap out of me.)
Being a tad more serious, that article was fascinating. I'd say it was realistic too..
Being a little less serious again (Well, serious enough) I had to be reminded of the virus from 12 Monkeys. If you don't know what I'm talking about, you haven't seen one of the best scifi thrillers of the 90's and you must see it now. NOW I SAY!