It’s sink or swim time this week, and fortunately for my own sanity, a whole lot of shows are obligingly gurgling their way to the bottom. This tendency for the chaff to vote itself off the island is being nicely counterbalanced by solid episodes from all the shows I give a damn about, so right now I couldn’t be happier about this season. At this point, it’s looking like I’ll cut down to between six and eight shows that are all roughly as good or better than my top two from last season – last season was weak, but that’s still a fantastic place to be. Running them down…