Mobile friendly web design was an after thought several years ago as most peoples mobiles just rang a friends telephone number. Try and have a web site thats not responsive. A website where the layout doesnt meet current gudielines. In that case you will struggle to get organic web traffic.
If your not designing your web site for mobiles as a priority, you are in trouble. Google is ranking all those that are, above you.
My articles look at the facts. This blog is their to help you realise the investment in a responsive website will not only give you a great new design, but will give you a chunk more traffic.