Has Titanic been forgotten yet?
No, because it has a very strong plot and it tells a story about one of the most famous disasters ever.
This isn't to say it's good or not good (still haven't seen it yet), but just to say that I don't see it being forgotten.
It wont be compared to the great movies, it will be remembered as a huge leap in technology, it will be very boring to watch when CG improves.
They said that about Star Wars too. ;)
But they put out 3 of the greatest movies ever. Avatar has one overated movie out. When I hear people talk about Avatar, the only thing they talk about is how pretty everything was, not anything to do with the plot. I couldn't even tell you 3 characters names from the film.
Where was the tragedy, the irony, the powerful ending in Avatar? I knew what the ending would be like an hour into the movie.
Just my 2 cents :)