THAT's Jin and Sun's fate? After waiting all this time for them to be re-united, fighting through hell and back, they finally get re-united last week..... just so she can get stuck and they drown?
Wow, talk about the opposite of a payoff. I sure hope there's more to Jin and Sun because that is an insanely crappy payoff to the whole storyline.
This kind of thought/discussion gets brought up from time to time on writing (screen & novel) forums from time to time.
It's always kind of interesting to get peoples different views.
Having characters live and have a big "payoff" (live happily ever after, ride off into the sun set, etc...) is the standard "rule", almost cliche, way of writing and telling stories. Why? because it makes the audience happy, even if it is not realistic.
So writers occasionally change things up and "break the rules" and have things happen that are random and realistic. Illana, Sun & Jin, Frank, Boone, Shannon are all examples of the writers on Lost trying to not go the standard way.
Does it always work? From the posts here, obviously not.
But it's a hard choice for them to make. If everyone got off the island and lived happily ever after, then lots of people would say it was dumb, not dramatic and unrealistic. But if they kill people off, in almost a random way, then they say it is unplanned, cheap and no good.
The writers really can't win either way they go.
The fact of the matter is no one in real life is a "star" of a show or tv series or novel. Anyone can die any time in real life, whether they are a bum living on the streets or a rich businessman or a newly wed couple on their way to their honeymoon or the guy who just got a big promotion 2 hours earlier. A car crash, plane crash, accident, brain clot, or whatever can kill anyone anytime. It's just life. Life doesn't wait for a big "payoff" or for you to complete a big goal or for you to "fulfill your destiny" or anything like that. People die. Sometimes randomly.
But when they apply real life rules to entertainment it doesn't always work.
It's a tough nut to crack.