The NFL goes in cycles. Something is introduced. Everyone copies. Teams adjust. Start again. The cycles tend to be about ten years. I think the first decade of the 21st century was dominated by elite QBs. Rodgers, brady, brees, manning, roethlisberger all won rings. Rule changes to pass game took defenses awhile to adjust.
I think the last decade has been dominated by defenses. Seattle, denver, new england, etc. Defenses went nickel and dine as their base defense basically and got smaller and faster to combat the pass
The question is what is the next trend. I think it's running backs. Looks like, this year, if you can't run you don't make playoffs. I think what happened is offensive coordinators realized if defenses are going tiny and fast we are going to go big and brutal. It's early so who knows but I would like us to get a franchise running back this year and start building that offensive line