It's not a matter of how much time you've had to play the game/watch the movie/read the book as it is that, after two years, most people who wanted to do so have done so, and putting forth effort to save the minority from being spoiled is a waste of effort. Why should people worry about saying Aeris died for the three people that don't know?

If a game has been out for a week than saying a spoiler would effect a large amount of people. After two years (which I think is a generous amount of time) it becomes the slow person's responsibility to save themselves. Are you incapable of being responsible for yourself, Cloud?