Sequels that were in theaters that almost no one remembers

The Sting II

Chinatown.

The Evening Star (sequel to Terms of Endearment)

Oliver's Story (sequel to Love Story)

Texasville (sequel to The Last Picture Show)

More American Graffiti 

They Call Me Mister Tibbs! and The Organization (sequels to In the Heat of the Night)

Rooster Cogburn (sequel to True Grit)

Cats and Dogs II: The Revenge of Kitty Galore

Hell, I think in general most movies, even ones that have a decent theater release, are mostly forgotten in not all that long.

like take this year for example, 2019... while there might be some movies from this year (that have a decent release in the theaters etc) that are remembered, I think most, if not the vast majority, will be largely forgotten soon enough. say, 5-10-20-30 years from now. plus, as the next generation of younger people grow up and get older, most movies from today will not even be a blip on their radar. sort of like how I suspect that people who are say 40-60 years old (or older) now probably have seen a fair amount of stuff from the past that most of these younger generations never heard of etc but I suspect it mostly comes back to what I was saying in that not many movies have any real staying power in general and that only movies that have a large enough appeal tend to stay around that get seen by generations to come.

but I guess that's sort of the way things generally work with movies in that not many have any staying power as the decades pass and are mostly forgotten by most people after not all that much time passes.

plus, another thing... like not all movies that do solid $ have any real staying power because usually the ones that do have to be a quality movie people remember and want to revisit instead of just being one of those movies that, in their day, was a decent enough way to pass a couple of hours but then the movie never really left any real impression on them which I think something like Transformers is a nice example of this in that while they make a ton of $, they are disposable. so while they might not be totally forgotten for a while due to the $ they made, they ain't exactly movies that people will call 'Classics' either and I think, given enough time, will be mostly forgotten short of those people who look into such things from the past on say 'movies that made a bunch of $' etc.

but I guess it just depends on what sort of standard one wants to use because if you want to stick to movies that at least done a fair amount of $ in the theaters I think that will make things more interesting in a topic like this in that I think some will still be either totally forgotten, or at least mostly forgotten. but if you want to use that standard of most movies, with at least somewhat of a name person in them, in this case I suspect plenty of movies will be totally forgotten by many in 10-20-30 years of time especially given that most people are not even aware of plenty of movies that are made out there as they simply don't garner enough attention by at least some people to make others aware of them that they might be good. sort of like this IMDB2 site, as some movies might be forgotten had it not been for others posting some of their favorites from random years etc which helps other people into movies be aware of them.

just some random thoughts