Today, the Oakland Raiders and the San Diego Chargers announced that they plan to build a stadium together in the City of Carson. In a press conference this morning, the N.F.L. and Carson laid out plans for a stadium, right across the 405 freeway from Ikea. Of course, this isn’t the only NFL stadium plan in town. Stan Kroenke, owner of the St. Louis Rams, has bought land in Inglewood, next to the Forum, and has been talking about building a stadium there and bringing the Rams back to L.A. Are we about to go from zero to three NFL teams?