Well, to be fair, since it came back family guy has always followed the Plot A to Plot B with subplot C every so often. Family Guy's been chief on the "cause and effect" principle for years now, and it's pretty shoved in our faces this last episode where peter says none of this would of happened if his record didn't disappear.
Shows like Futurama, South Park, American Dad, basically just have Plot A with Subplot B, more often than not they don't even have a Subplot B.
Also, it's pretty apparant that Seth McFarline doesn't give a **** about the show, since he got paid like 100 million to extend it, and American Dad for another 3 seasons. Once you're getting that kind of cake, you can just throw whatever the hell you want in there and call it genius, because in some way it is.