Trends in the NFL come and go, but the essential nature of quarterback play around the league doesn't really change. Taking a quick look at the standings halfway through the year illustrates the point.
Those who have elite answers at the position also happen to be the best teams in the league. Wins aren't necessarily a QB stat, but they often come a lot easier for teams when they have a signal-caller who can elevate the group around them.
Halfway through the season is a good time to step back and evaluate the current hierarchy of quarterbacks across the league.