The problem with the GPS+Compass is that, on any affordable device, these sensors are of such poor quality that they are almost useless for AR.
Of the 5 platforms he points out, I’d say the only two important ones are smartphones and tablets;
handheld devices offer a unique first-person perspective that I believe is essential to leveraging the full power of AR (this perspective is also offered by HMDs):
Consumers will rarely use these applications after the novelty factor wears off. At best, these applications provide an alternative viewing mode for data that should be first presented on a 2D map or in a list.
Focus on Utility and Fun, not Novelty
After the “wow factor” wears off, there’s a risk that consumers may begin to dismiss AR as a gimmick rather than a technology that provides real value