I'm sure it's been said already, but the road has to end somewhere because the map has to end somewhere. I'm pretty sure a road ending at the edge of the map isn't really indicative of any intent to put something there later. That just means... that's where stuff ends.

Wait what are you talking about? If you are talking about the Road to High Rock.. Then I would think the opposite.. The road to High Rock ends at a Rock on the border to High Rock.. But the rock has a weird indentation like a cave would have..

But if you mean Morrowind's side then I would agree with you.. The only thing that would give me evidence of a Morrowind add-on is the lack of any quests involving the Vigilants of Stendarr and their base if right on the border basically.. They are against Daedra and a lot of Dunmer worship Daerda.. Which is weird

Is this topic still going?

Not all of the heightmap is made, just the immediate bits surrounding Skyrim. So for example half of Morrowind is missing, they'd need to recreate the heightmap for the rest of Morrowind, else you'd just have half a province.

It's just for distant LOD. The Skyrim landmass is a lot bigger than the Skyrim depicted in Oblivion. There's not a single other complete province in the heightmaps included in Skyrim.

We might well see a DLC set in another province, like Tribunal's expansion for Morrowind, but there won't be a whole province. They just won't go to the effort of doing that, and if it would be then it would be massively reduced in scale because of time restraints.

Also, about the Daggerfall remake, "I'd love to" is a lot different from "We are going to."