How often have we heard of something becoming a "cult classic"?
Initially a low scoring/earning piece of work that garners more attention over the years - just look to 2012's Dredd movie as evidence.
It's the same in gaming, too. Take Shadow of the Colossus - critically praised on every level, but didn't set the world alight with sales. Yet, it garnered enough continued support to warrant an HD transition and a full remake on current-gen consoles.
However, sometimes a game comes out that is so universally loved (or at least, by those who played it), yet ultimately it's a "failure" when it comes to warranting a sequel or continuation. That may be a good thing as it avoids the property being run into the ground or the creatives to run out of ideas, but there are times when a game is so good, we'd just like some more.
As it stands, we're currently not holding our collective breaths that any of the following ever come to fruition. So whilst we continue to inhale and exhale as normal, let's have a look some other much loved games that won't be getting sequels.