I reckon we will learn what happened to the dwemer in the next TES game.
Why? Well, Vvanderfell has been destroyed and the dark elves are weak. This all sets up the basis for a dark elf comeback in the next game. They will try to do what their ancestors (dwemer) did and thus we will learn what happened.
Honestly, the actual game (mind you I said game, not the speech between 2 NPCs) pretty much set up TESV for the "Fall of the Empire" due to having no emperor. In actual medieval times, if the figure head and all descendents of so died, almost every province in its control would revolt. I mean, this is a different situation being that Ocato will name a new emporer... But people will be angry
In morrowind, there was alright a plot against the current Emporer for being weak. Unlike Tiber Septim.
Now, imagine all the blades who serve the "Dragon-Born"
How will they feel when they are lorded around by some random person not related to the actual septims? and I know that many provinces resent the entire control the empire has. I see revolt even more.