After over a Year of Warnings, Google lowers the Hammer.Sites that don't follow the Mobile Rules are plummeting in rankings, even to the point of being De-Listed.
Google is now taking action.They have tried to help, even to the point of sending messages to domain owners.Now they are taking action.Chances are your site is affected.Here are the most recent announcements.
Do Nothing and be De-Listed.Try a Local Webmaster."90% of Webmasters are doing it Wrong." (Direct Google Quote)