I don't think Gamefreak/Nintendo really get what people mean when they say they want more post-game.
To me at least it is very much NOT post-league story content, rather it is the gameplay loop that exists once everything else is over. The core element of post-game to me is replayability. And frankly, the battle tower just doesn't friggin cut it. Now getting more story content is neat I guess but it just isn't what I, and I assume many others, are asking for.