Taleroth wrote...
It can be long-running. There's a 99% probability in that attempting to do so it will have more in common with Star Wars EU or Spider-Man comics. What precisely is the state of Aunt May now? Alive? Dead? Remember when it turned out that her death was just an actress. Or Spider-Man made a deal with the devil that undid several years of character development. That was absolutely terrible.
But consider the reason
why Discworld pulled it off - the only common thread is the world. It's not constrained by individual characters or plots. There's, what, only like 4 or 5 books where Rincewind is the main character, after he was the main character in the first 2 books? He's a great character, but if all the books were about him, it would have gone stale pretty damn fast. There's simply a massive amount of different characters and stories.
Can't do that with Spider-Man, for obvious reasons.
So, yes, if they keep making games about Shepard and/or Reapers, then it will get old. But if they take a chance and start to tell new stories, with new characters and new themes, then the universe could very well go on as long as Discworld and still be fresh.
Also consider that in terms of the Star Wars EU, a lot of the most interesting stuff tends to be the ones with new and interesting stories and characters. That's why KOTOR is so great. That's why Thrawn was a great idea.