A GRIP ON SPORTS • If you’ve ever been a fan of Wiley Miller’s “Non-Sequitur” cartoon, you know there is one trope that pops up often. It features a long-haired, shaggy fellow holding a sign that states, simply, “The End Is Near.” And then the punchline arrives. Well, for the Pac-12 as we’ve know it, that guy has been hanging out on Third Street in San Francisco recently. The punchline? It hits in a month. And no one is laughing.