I actually think there's a ton of potential in a Falmer-based DLC, mostly because the Falmer could actually have a chance to utilize some of the Dwemer technology that puzzles so many mortals today. I'd also love more insight into why they make other people blind, and what their ultimate goal is by feeding people to the Chauruses. It could work, if done correctly.
Dwemer lied and said they would protect them from the Nords, then they turned them blind by forcing them to eat some kind of fungus, and then turned them into slaves and then the Falmer revolted and waged war with them all the way up to the point where the Dwemer disappeared and left a permanent mental scar that makes them always want to fight and kill and now the Dwemer must come back to kill the monster they created or fix the problem they started... Perfect DLC if Bethesda made one like that and then in the new Elder Scrolls game we can play the Dwemer. Now that would be fun if you ask me.
The Dwemer didn't lie. They
did protect them from the Nords, they just made them into slaves.
Also, for the love of Shor, people have to let this "playable Dwemer/return of the Dwemer" thing go. It is never ever going to happen. Not only would it completely ruin all of the mystery, and not only would it be impossible for them to live up to the hype, but it would be impossible to truly understand them and impossible to roleplay as one for that reason. You cannot understand the Dwemer. The Dwemer understood the entire universe. They were atheists in a universe where gods exist. They could divide by zero.