Yeah we're starting to see a shift in the league again. Linebackers have gotten smaller and defenses are playing in nickel more often than not. TE's are like cheat codes against them. They also happen to be a young QB's best friend. If you can get an elite one that doesn't drop the ball and can make contested catches then you're way ahead of the game.
With an elite QB a platoon of RB's made sense. Early down ones were useful because of the play action pass opened up the deep plays and then a receiving one was also useful for obvious reasons. Without an elite QB then you kind of screw yourself because teams aren't worried about the deep pass as much so the early down RB ends up just getting stuffed and before you know it you're in 3rd and long with a young QB.
Without an elite QB the two of the most important positions on offense become an every down RB and a TE.