As I said to my son yesterday, non-performance bikes will retain mechanical shifting and rim brakes for some time to come. Only performance bikes will have electronic shifting due to the cost. Enthusiasts are most always happy to adopt the latest technology, it is their hobby after all. For those that simply ride a bike without the enthusiast point of view, electronic shifting is not necessary, and some will go so far as to state it is unwanted. Simply the evolution of the bicycle.