Games are pretty chancey. There's no surfire way to tell how games will do. Mediocre, or barely functioning games can get sequals and franchises, while truly phenominal titles sometimes get stuck with cult status, if they're lucky. Even with flocks of ravenous fans begging for more, for one reason or another, it looks like the idea of sequels is dead.
There are games we all found that just struck us as Right. We played it, nay, we absorbed it. The story, the characters, maybe the gameplay or art. And when done, we could only think "More". And we waited, like good little fans. Waited for any little bit of news on our new favorite (hopeful) franchise, word on sequels or DLC or even other games by the developers. And wait. And wait. But more time passing, fewer articles, and most dreaded and all too common nowadays, developers closing their doors. And here we are.
What games do you wish got sequals, but just don't see it happening? Even if it was said that the developers were working on one, but there hasn't been any word for a while, and they dodge the question of when it's supposedly coming.
Personally, I would love to see a new Banjo Kazooie like the first 2, or a new Perfect Dark. Outside Rare love, I'd like some more info on a new Mirror's Edge, and up until a little while ago, I would have said Deus Ex, but it looks like we're getting a decent sequal now.