Chances are that you competitors aren't making use of responsive designs, which means that they are losing out on potential customers. And, that is where you can stay ahead and take those customers away.
A smarter set of technologies is what we need for the mobile. During periods of high speed and high quality bandwidth, mobile apps should anticipate what we're going to read or watch and cache it for later. Don't make us have to remember to pre-download or prepare for being offline.
Although the differences between responsive and adaptive design are nuanced for the non-developer, the distinctions are increasingly important as publishers see more and more traffic come from mobile devices.