Well, at least mammoths do so in Skyrim...
TES lore goes as far as TES goes. Forums are a place to theory-craft, not lore-craft - the latter is only valid in the game or in the books, because those are the only parts that actually belong to the TES series.
The people wo made the story are no better at interpreting stuff than the rest - as long as it's not canon, anyone, be it dev or player, can only theorise what could have happened. Because, if a scriptwriter crafts the story till a certain point and leave it open, having some specific way in their mind to continue it, but then they are replaced by someone else, the story will probably not continue as the original creator had visualised it, unless thebackstory is very limiting as to what could have happened.
So, could you care to list those clues from Morrowind that suggest with relative certainty that the Dwarves are gone for good?
Are you seriously telling me that an author, any author, does not know what he means by his own work?
I have provided several links and texts above that do just what you are asking for.
The Final Report to Trebonius is pretty definitive. As I said, it encompasses all that can be learned from Morrowind among other things.
And once again, your take on what is lore is too narrow for TES.
TES lore does not rely soley on what appears in game, it is too narrow and limiting a scope of what otherwise is a masterpiece of intricacy and depth.
I invoke it 'boring and therefore wrong' to see TES lore as solely what appears in-game.
The Monomyth"But this was a trick. As Lorkhan knew, this world contained more limitations than not and was therefore hardly a thing of Anu at all. Mundus was the House of Sithis. As their aspects began to die off, many of the et'Ada vanished completely. Some escaped, like Magnus, and that is why there are no limitations to magic. Others, like Y'ffre, transformed themselves into the Ehlnofey, the Earthbones, so that the whole world might not die. Some had to marry and make children just to last. Each generation was weaker than the last, and soon there were Aldmer. Darkness caved in. Lorkhan made armies out of the weakest souls and named them Men, and they brought Sithis into every quarter.
Vivec:the Dwemer:"I have no idea what happened to the Dwemer. I have no sense of them in the timeless divine world outside of mortal time. And, in fact, if I did believe they existed, I would be in no hurry to make contact with them. They may, with some justice, hold the Dunmer race responsible for their fate. My intuition is that they are gone forever -- and that is perfectly fine with me."
:Dwemer's sin:"The sin of the Dwemer was the creation of a new god from the substance of a dead god, Lorkhan. That is also the sin for which we would destroy Dagoth Ur. I hesitate to call it 'sin'. More properly, call it 'destructive evil'. The sin of the Tribunal, however, is in the breaking of an oath to Azura to forebear from tapping the Heart with Kagrenac's tools, and in the folly of seeking to become gods. Breaking the oath was evil. Becoming gods was folly. If we sinned, we have paid the price."
Baladas Demnevanni“It was unfashionable among the Dwemer to view their spirits as synthetic constructs three, four, or forty creational gradients below the divine. During the Dawn Era they researched the death of the Earth Bones, what we call now the laws of nature, dissecting the process of the sacred willing itself into the profane. I believe their mechanists and tonal architects discovered systematic regression techniques to perform the reverse -- that is, to create the sacred from the deaths of the profane.As the Dwemer left no corpses or traces of conflict behind, I believe that generations of ritualistic 'anti-creations' resulted in their immediate, but foreseen removal from the Mundus. They retreated behind math, behind color, behind the active principle itself. That the Dwemer vanished during a conflict with Nerevar and the Tribunal is merely coincidence."
Yagrum Bagarn"Lord Kagrenac, the foremost arcane philosopher and magecrafter of my era, devised tools to shape mythopoeic forces, intending to transcend the limits of Dwemer mortality. However, in reviewing his formulae, some logicians argued that side effects were unpredictable, and errors might be catastrophic. I think Kagrenac might have succeeded in granting our race eternal life, with unforeseen consequences -- such as wholesale displacement to an Outer Realm. Or he may have erred, and utterly destroyed our race."