First of all I am no lore expert, more of an uneducated enthusiast (they are the worst, I know). Thanks to the forumic metadivinity that occasionally identifies itself as Mikhael Karkuxor we have been given some information on the far-future of Mundus.

From what we know by now, aetheric space travel has been established and there are outer colonies beyond Nirn. Apparently engineering of the 9th era has exceeded the dwemeri craftsmanship through the creation of sentient machines. The Hist have seemingly established an even stronger presence on Tamriel. Yet at this point it seems that what we know as Tamriel has gone through a complete metaphysical transcendence into a hypercosmic gridwork that resembles a matrix of an advanced quantum computer. The godhood we once knew as Talos is interpreted as an malevolent operating system perhaps comparable to a virus or a more mundane equivalent of the MS Windows. The races of the 9th era still remain obscure. Do humans exist? Probably not, at least in their carnal form. What about the creatures who came to Nirn from the stars in the 5th era (House Sul)? Is it even possible to create a video game that can visualize all of this?

So, the time we'll get to the Ninth era, we are probably playing on TES IX or something, right? That's in the 2040's maybe. If we are lucky we will have quantum computers and virtual reality by then, and we will be able to actually create Mundus at that point. Hopefully MK is still going to be around. I guess TES won't be a fantasy game at that point, perhaps something closer to scifi and weird fiction.