We’ve been building almost exclusively with responsive layouts for the past couple of years. This ‘History of Responsive Web Deisgn’ blurb from wikipedia sums up nicely the inevitability of this major shift in web design:
Ethan Marcotte coined the term responsive web design (RWD) in a May 2010 article in A List Apart. He described the theory and practice of responsive web design in his brief 2011 book titled Responsive Web Design. Responsive design was listed as #2 in Top Web Design Trends for 2012 by .net magazine after progressive enhancement at #1.
Forbes featured a piece, ‘Why You Need To Prioritize Responsive Design Now’  where the importance was made clear that having a mobile version of your website isn’t enough anymore. Jody Resnick, President of Trighton Interactive stated in his interview with Forbes, “Responsive websites simplify internet marketing and SEO. Instead of having to develop and manage content for multiple websites, businesses with responsive sites can take a unified approach to content management because they have only the one responsive site to manage.
Resnick predicts, “As the internet transforms further into a platform of services and user interfaces that tie those services together, leveraging this technology in the future will allow companies to integrate a plethora of back-end services, such as Facebook , Twitter, Salesforce.com , and Amazon Web Services, and then present the integrated data back out the front-end iad layer on a responsive design so the application looks great on all devices without custom coding needed for each device or screen size.
With the proliferation of mobile and tablet users globally, the need for a responsive website is inevitable.