The humble pizza, long a staple of American Friday nights, is losing some of its magic. After decades of dominance in quick-service dining, pizza restaurants are facing a stark reality: their once-dependable popularity is waning, and competitors are eating their lunch (and dinner). Industry data shows that the U.S. pizza restaurants market has been shrinking in recent years, even as other restaurant formats – from fried chicken chains to fast-casual eateries – are flourishin