The article doesn't suggest any books to replace Catcher in the Rye. I would probably suggest "Drown" by Junot Diaz:

http://www.amazon.com/Drown-Junot-D%C3%ADaz/dp/1573226068

But Catcher in the Rye is a great and captivating story in its own right and doesn't really need to be replaced... though it would be great if schools taught edgier fiction these days.