Ouch. I believe you misunderstood him (and took a quote out of context). He's saying if we all reduce our resource consumption, then everything would be fine, but such a reduction is not possible because then* we wouldn't be able to support everyone, which is true. He's not saying we can't support everyone now. He's talking about a hypothetical situation.

As for the article, I find it distasteful. Generalized, sweeping statements without hard evidence to back most of them. And here we are two years later (which is mighty close to a "few years" later, which he referred to in the article) and none of the predictions are even close to becoming huge problems. (The current economic problems are not related to his predictions.)