Can someone tell me what the HELL was the point of going through all that trouble to save Morrowind if it's just going to get obliterated a generation later. Some Nerevarine... ran off and let the Argonians take over Morrowind. What a terrible decision to let one no-name author single-handedly write such a huge effing huge scar into the lore of the Elderscrolls. I'm pissed.
But... how do we know that Bethesda didn't tell the author what they wanted to happen? Maybe they told him that they wanted x, y, and z to happen, and he had to incorporate it into the story. I doubt they'd let his idea of a plot override everything else. In fact, they were probably working on Skyrim before/as he wrote TIC, so maybe certain things had to happen in TIC to make events in Skyrim line up.
Besides, that's pretty much what happens in history, both in the real world and in TES lore. Some hero saves the world... only to have another threat come up later.
However, I haven't played Morrowind, so maybe that's why I don't care as much.
(Of course, this is assuming that Skyrim takes place after TIC. If it's not, then my point is moot.)