I would not mind baseball going to 7 innings and I did like the 7 inning doubleheaders. I'm not super concerned about long games but I don't love the bullpen portion of the game, nothing against a dominant closer but 4 innings of bullpen pitchers is not great to watch.
But pitchers going 7+ is not coming back so why not shorten this whole bullpen thing by making games 7 innings, nobody wants to see middle relievers.