Earlier quoted context omitted.
Yes, it was, until he executed on it as an adult and formalized it and made it into something useful. Had the idea stayed an idea, or just been handed off to someone else who hadn't the mental capacity to do something with it, it would have remained worthless. In short, Paul was right. Ideas are worthless. Ideas plus execution can have value. Why fight it? Got some great ideas but no capacity to execute? Just accept…
If something is worthless because people will not give you money for it ("make something people want"), then there is nothing inherent in ideas that makes them worthless. It is simply the fact that most people would not pay you for ideas that make them generally not a profitable endeavor.
http://journal.dedasys.com/articles/2007/04/26/ideas-are-worthless
In short: for practical purposes, PG is right, but wrong in his theory.