One of the big benefits of responsive design is that the size of the template is designed based on screen size, not device. This means that no matter what size screen someone is viewing your website, it will display properly for that screen size.
So, in the future, as new devices (TVs, watches, glasses, etc.) are being used for web browsing, your responsive site will still look beautiful.
It will be extremely critical that your website provides mobile users an easy-to-use experience. Having a mobile website is no longer simply a luxury — rather, it is now a necessity and literally impacts the growth of your business.
Curious about the possible return having a mobile website might have? I’d suggest checking out is this “Full Value of Mobile” calculator by Google. Here, you can input different variables about your business and marketing, and it will give you a full rundown of how your metrics can be increased with proper mobile design.