One-in-two mobile owners in the US owns a smartphone, and many more own tablets. As most of these same consumers adapt their personal lifestyle to be "mobile first", they expect their employers to be there to meet them. With the growing number of personal mobile devices in the hands of users, as well as increasingly remote organizations, there's a great opportunity for organizations to increase productivity of their employees by allowing the use of these personal devices.
Taking this on seems daunting, as IT has less ability to enforce a single standard than ever before. Not taking action, however, and ignoring this trend risks exposing corporate data to public clouds with no visibility on the part of IT. Enforcing a single standard will do a lot to serve all users partially, but none particularly well.