I don't want to be the one to point this out but, Tiber septum ascended to divinity and I'm pretty sure my character could kick his scaley dragonborn [censored]. I expect my character to ascend as well and become the 10th divine, ?sir Pantheon, God of power. I like the sound of that, they should make a Dlc where the aedra consider ascending you but then they're attacked by the deadra and you must save them, and when you do they bestow upon you a promise, that when your time in the mortal realm is over, you will ascend into the heavens as son of akatosh, but until then you are just a demigod and are given a quest reward power that reflects your god status, perhaps a transformation.
That would definitely keep in allowing for continuation after the DLC but set up lore for the next ES. Not sure about the Aedra being attacked by daedra is believable, but their could be something there.
It would be kind of cool to see a part of the next DLC with the moot convening and deciding the next High King of Skyrim. I like the idea of the dragonborn becoming the High King, but obviously becoming the Tenth Divine is way more preferrable.