You'll have to add me to the list of doom-sayers. I can agree to a point that a lot of people are more intellegent than schools are teaching them to be. Which is really a whole 'nuther topic, but schools clearly need to be massively revamped. That said, I think there really is only so much "knowledge work" to be done, or at least marketable, regardless of how smart people are. For example, how many people can make a living doing skins, even if everybody had Object Desktop?
Of course it is silly to say there is only a limited amount of work to do, there is always an infinite amount of work to do. The question is, how much can be sufficiently marketable to produce jobs? If food, transportation, sanitation are all automated, what else is there for the rest of the world to do, build Object Desktop skins?
Of course, the other possibility might be a fundamental redisign of society, akin to Star Trek, if humanity is capable of such a society. Where basic necessities are a given part of society and everybody is free to do their thing. But I have the strangest feeling that most people who live in such a society would, instead of reaching for the stars, probaby actually be masturbating and eating pizza and beer.