Prof. Lynch's work isn't a complete tome on the subject, but does move hip-hop scholarship forward. He provides insightful commentary on the beef between Jay-Z and The Game, while perhaps providing an opening for those who might be interested in international relations to read up on hip-hop.
Lynch's work isn't without fault or beyond inquiry, however. One wonders if the theory could be applied to other artists and if it should. One also wonders where message-oriented rappers fit into the puzzle. Is Common Canada? An important ally of mainstream hip-hop (the hegemonic US), but with a soulful introspective stance (perhaps akin to Canada's environmental and social welfare policies) that often positions him at odds with mainstream commercial success (US hegemonic discourse). Do countries that veer toward more socialistic or environmental policies equate with message-oriented artists? If we take Lynch's analysis and apply it to early hip-hop does it still hold true?
You can listen to Marc Lynch's interview on NPR here. The theory might not be complete, but Lynch has the ball in his proverbial court. It will be interesting to see what develops from this new discussion.