Since I assume we've all seen the amazing Arrival trailer for Elder Scrolls Online, it seems that an Elder Scrolls movie or series would be a good thing. Possible movie and series addaptations of Oblivion or more likely, Skyrim would be interesting. I'd imagine a Game of Thrones like series following the Dragonborn and some of his companions on the quest to find a way slay Alduin while the civil war rages on in Skyrim. Then, the addaptations of faction questlines and the expansions. On the other hand, we have a trilogy of movies like the Hobbit or Lord of the Rings.
Another possiblity is movie based on past events, like the Camoran Usurper's Invasion, the Battle of Red Mountain and Tiber Septim's conquest of Tamriel. They could at least make long tie-in movies or videos, setting up the world for future games. A Battle in Cyrodiil setting up Cyrodiil being divided in the next game, an alliance between Nords and Dunmer being made in Blacklight, a Breton king being assassinated. Basically, imagine if we had a trailer featuring Ulfric killing High King Torygg and General Tullius fighting in a battle, then at the end, we hear and maybe even see Alduin return at the Throat of the World.
The Elder Scrolls could be adapted into a major movie series, or a televison series. Personally, I like the idea of a movie beign about the Battle of Red Mountain, with the Chimer fighting the Dwemer, then the Nords stepping in. I think the Khajiit were also involved.