Responsive design isn’t going to be enough when it comes to providing workable user experiences for mobile Web users. New techniques are leading to an “inversion of control” from server side to client side interactions and interfaces will increasingly mimic look and feel of native apps in terms of navigation an touch control.
One of the first comments on his articles pointed to Google’s Progressive Web Apps which is another framework. For mobile sites, Google has also been advocating for the Accelerated Mobile Pages Project which provides a HTML variant and caching service for faster serving of mobile Web pages. These are technologies that Web developers need to be digging into.