David Pogue's glowing review of the XO laptop in the Times is a big deal. He's probably the #2 personal computing columnist in the US, after Mossberg, and he's just given the XO his stamp of approval for use by US kids. Remember here that this is David Pogue we're talking about. He's a Mac guy. You can search in vain for his articles about Linux on nytimes.com. He likes things that work intuitively; he hasn't made his career turning people on to idealistic projects that don't actually work.
So... the stage is set for a very quick sell out of the first 25,000 XO's made available for order in the US come November. What comes after that is anyone's guess. As long as they can keep the production lines running at Quanta, the project can stay alive. I think they'll find a way to do that. With a substantial consumer market proven in the US, it seems virtually guaranteed.