The document is 10 years old. Many things have changed. I'm not a US citizen (apparently the target group), but somehow I doubt that such an old text would adequately reflect this.
As I wrote, I don't know the current situation in the US well enough to deduce more than guesswork from it. Here, at least, it has a great impact on someone's choice of the right organizational form. Cooperatives are not out of the question, but you have to consider some newer factors to do it right.