The game is constantly evolving. With defense playing more shell coverage, focusing on pass rush specialist on the dline, and exchanging LBs for Safeties why would you not run the ball more?
For years we have witnessed the passing game absolutely explode in this league to the point where even average QBs can put up 350 yards any given week. Defenses have adjusted and are finally catching up to the pass heavy attacks. The rules favor the passing game too much for it to completely flip, but I would anticipate the trend of run heavy teams continues for a while. The piece to keep an eye on is how do they do that. Is it with more dual threat QBs or a more traditional approach.
Eventually defenses will start prioritizing interior run stoppers and off ball LBs again (some already are) to stop the run game and the better throwers in the league will feast once again once that happens.