Battles With Death Eaters
Harry Potter is a tale of good and evil. Niantic must find a way to bring the tension created by that struggle in the books and movies to this new game. Otherwise, it leaves out an entire generation of fans that want something more than a generic mobile game with Harry Potter in the title.
Instead of battling for control of Gyms, Harry Potter Wizards Unite players should battle for control over the muggle world with what remains of the Death Eaters. Voldemort is gone, but many of his most passionate servants remain. Battles in the game could involve beating back dark forces trying to expand into the muggle world.