Absolutely. EVERY site that I design and develop is mobile responsive. This is now an industry standard across the board. If your current site is NOT responsive you are losing business and credibility with Google. Google now ranks websites higher that are mobile responsive and follow the guidelines that go along with that (example size of text on a mobile device).

Consumers are now trained for this as well. People will not take the time to pinch and zoom so they can read your text or find your contact info on a website that is outdated and only designed for a desktop computer. They will simply move on and find your competitor instead.