I've had this idea for a TES game in the future, DLC, or whatever. So, here goes. To make this easy, I'll use Skyrim as a reference point. I think it'd be interesting to play as another character for a brief time during a quest, possibly during a MQ. For example, let's use the Skyrim MQ. Alduin's return has also spelled the return of the Dragon Cult, and they are quite zealous. They ambush the Dovahkiin in large numbers(infinite to be exact) and are many levels above him. Once he loses all his health, a Draugr uses some kind of a paralyzing shout and you fade to black. The Blades find out what happen and set out to rescue the Dragonborn. Esbern takes the lead and Delphine is your follower. Esbern has a set level with his own inventory, perks, skills, spells etc. The cultists are going to sacrifice the Dragonborn and you have to rescue him before that can happen. Once you do, you revert characters.
Do you think this could work in a future game or DLC? I think it would be interesting if done right. It should only happen once for one quest. L.A. Noire did it pretty well. For the entire game, you play as Detective Phelps, but in the last few missions you play as someone else(but someone who is directly related to Phelps and the MQ in general)
Heck, if Bethesda wanted to, they could also do it from the perspective of the villain as well. Play as a high ranking Thalmor agent who has to hunt somebody important down and extract vital plot information. Once that's done, the PC somehow intercepts or eavesdrops and discovers what they need to know.
I think Bethesda has the capacity to do this and do it well. What do you guys think?