The NFL’s TV ratings are being monitored on Wall Street, with some financial analysts saying that another big ratings drop could affect the standing of some broadcast companies. “We continue to believe the NFL is the single biggest swing factor for media earnings and valuation,” read a research note released this morning from MoffettNathanson. “Any sign of continued NFL ratings weakness could pose a long-term risk for broadcasters who may be forced to bid up for rights.” The most interesting part of the report looks into the next round of rights negotiations, with the report suggesting that ESPN should drop...