The problem is, the often overused phrase now "too little, too late" but really; it's because people aren't going to McDonald's to be healthy! So them becoming more healthy is hardly going to attract any new customers at all! People concerned about health are going to the grocery store not getting fast food.
People eat fast food for the flavor, not for their health. We've known this for decades. At least I don't see these helath tactics working in America. It's also increasing the size of the menu and people will feel disappointment making their decision, whether to be healthier (and miss out on flavor and their cravings) or be unhealthy and regret it because they know it's worse for their health to enjoy their meal to the maximum flavor of the fast food diet.