I understand that Aedric and Daedric involvement in the affairs of Mundus don't manifest in the same way and the Aedra rarely take direct action. However, I'd really like to see some more active involvement of the followers of the Divines, including quest lines akin to those of the Mages and Fighters guilds. There are plenty of quests involving Daedra, many of which provide significant rewards, and I think that the churches could do more in the world than simply provide a place to adjust your skills and attributes. They wouldn't necessarily need to engage the Aedra directly, but their followers could take a more active role in the world and function as their own guild of sorts. The Mages and Fighters guilds seem to take so much of the credit for things when the church should also have a great deal of power and influence in the world.
We have the Mages, Fighters, Dark Brotherhood, Thieves, Psijic Order, as well as quests for vampires and werewolves...and no active organizations for the Divines. In past games we've had orders like the Dawnguard and the Vigilants of Stendarr and the Knights of the Nine. It feels like that sort of path is missing in ESO, and I think it's an opportunity to expand our roleplay and gameplay options. Ideally I'd love to see something like the Psijic Order, with a story all its own and a skill line to go along with it.