The practical consequence of an Americans-only rule is that the NFL kneecaps its own biggest growth engine. Football's future audience is overseas, and the halftime show is basically a 12-minute global ad. When a Bad Bunny or a Shakira plays, you're broadcasting to millions who don't know a first down from a field goal. Excluding them is like a band refusing to tour abroad. Sure, homegrown talent deserves the slot, and it usually gets it anyway. A nationality filter just shrinks the stage for no real gain.