I don't understand how anyone could think that I am not aware of the original expression which I have paraphrased. As others have noted, JSON is a local optima solution to a particular group of problems. Using S-Expressions does not improve on that solution, they in fact are less of a good fit.
The same way that many misunderstand Lisp, thinking that this would be a better fit to the problems JSON addresses, misunderstands JSON (or those problems).