I'm not sure about the technical limitations of LTE, but for densely populated cities (case in point: Manhattan) WiFi might be a better choice, even in an ideal

I'm not sure about the technical limitations of LTE, but for densely populated cities (case in point: Manhattan) WiFi might be a better choice, even in an ideal world where mobile data cost much much less. Google is interested in mobile applications that will use more than a few GB of bandwidth per month, like Project Glass maintaining a constant connection and streaming photos or live video. Any interesting vision of the mobile future requires vastly cheaper bandwidth, one way or another.