You can't ignore how prevalent mobile Internet use is, mainly because the world's leading search engine isn't ignoring it. (Check the stats here.)
Google will implement a change on April 21, 2015 that will impact how easily your website is found by people conducting online searches with a smart phone or tablet. Yes, change can be frustrating and even costly, but there's sound logic behind Google's shift. Plus, it represents an opportunity for you to move up in search results, while those who ignore the change are sure to slip in the rankings.
Read this WebArt blog post to learn what Google is doing and how you can benefit from it.