Four weeks into the current NFL season television ratings are down nearly 10% overall compared to the first four weeks of last season. Sunday’s games in Week 4, according to Nielsen, had the smallest audience of any season so far: an average 14.2 million viewers. Add that ratings dip to the ongoing controversy around player protests, and you might reasonably wonder how official NFL sponsors, as well as brands that buy advertising during NFL games, feel right now about the league. The answer: “They’re nervous,” says Brian Cristiano, CEO of ad agency Bold Worldwide. “Everyone is looking at the numbers,...