SAN DIEGO — Another NFL season having reached its final week, it’s time, football fans, to serve up one of those ridiculous questions we media nitwits tend to ask. Blame it on the Baltimore Ravens. They made me do it. Can any NFL team overcome the purple-and-black machine that trounced the Dolphins Sunday, 56-19, to earn the AFC’s top playoff seed just six days after it crunched the NFC-leading 49ers on the road? Sure. Someone might do it. Bigger upsets can be found in many NFL postseasons. It wasn’t long ago, after all, that the 49ers looked spooky. But unless injuries bite them, the Ravens (…