They'd be a good way of making exciting expansion packs set during some of the interesting periods of Elder Scrolls history. Arnesian War for example chose to help free slaves or raid the jungles, similar I suppose to the Skyrim civil war.
Also Daedric realms again, everyone loves a daedric realm.

I honestly hope there isn't time travel it would just be so stupid in my opinion and could hurt the past as well as the future of the TES timeline.