McDonalds Has the Right Idea

Why can't every restaurant be like McDonald's? I mean the food isn't world class or healthy, but what if every family restaurant had a playground? My mom and I took the kids there yesterday and it was so nice when they got done eating I could actually finish my own food, have a conversation, and not have to worry about anything being messed up. If more restaurants had a play area I bet more money would be spent there. Wouldn't you eat at a place where the kids could go off and play and you can get more then two consecutive bites in and end the dinner without indigestion because of speed eating? Why has only a fast food restaurant thought of this?