This is going to sound extremely simplistic, but I'll give an example of why I think it is true:
I believe that human progress takes place, when human beings are forced to do things that they either don't see necessary, or feel comfortable doing.
One of my relatives knows a man in his late 50's, who loved motorcycles in his youth. One of his favorites was the Honda 750 from the early 1970's. During his youth, this man had very little money and what he liked the most about the bike, was his ability to keep it running by tinkering with its mechanical components. As technology advanced, and electronic ignition became standard on most Japanese motorcycles, he refused to upgrade to more modern designs stating that they weren't necessary. From his point of view, he always knew that if his bike broke down far from home, he could fix it and return home.
Currently, most Japanese motorcycles around 600cc will run at least 150 mph off the showroom floor, and remain stable at those speeds. Modern technology has greatly improved both the brakes, electronic ignition, suspension, tires, and dependability of motorcycles. NONE OF THOSE THINGS WERE NECESSARY, but there were designers and enthusiasts who cared enough about them to create what exists today.
The older gentleman who thought he would never buy a modern motorcycle, was convinced several years ago to upgrade to a current model (Yamaha). Now, if his late 50s he flies through the countryside at speeds sometimes over 110 mph. Whether that is safe or not is another story, but to this day he has never been stranded because of electronic ignition that he feared in the past. He loves the motorcycle, and has accepted the changes in design.
I wonder if most people who are currently against Mobile Responsive Web Design, will come to appreciate what has evolved in the near future.