People replace smart phones mainly because they are slow or have become slow, or they want some new feature that isn't available on their current model. As smar

People replace smart phones mainly because they are slow or have become slow, or they want some new feature that isn't available on their current model. As smart phone mature this becomes less common, the technology will get to good enough level, speed, battery life, camera, and people will not feel compelled to replace their smart phones every year. Hell I bought my Nexus 5 on release and don't feel the need to replace it yet.