Consider this a friendly reminder that if 50% of your business comes from Facebook, SEO or pretty much any source which you don't control entirely you should be

Consider this a friendly reminder that if 50% of your business comes from Facebook, SEO or pretty much any source which you don't control entirely you should be doing everything you possibly can to fix that problem ASAP and ensure that you aren't setting yourself up for a very nasty surprise one morning. "Fairness" aside, be thankful in this instance that you are getting advance notice. I wouldn't assume that you will always be as lucky in the future.