But that's what I mean. They don't give him a happy ending in the actual run of the film. They set it all up and they have a bittersweet tragedy. Will lives but can't be with Elizabeth.
Then they change it to a happy ending ten years later in an after-the-credits-have-rolled 10 second scene.
I'd rather the film built to it's conclusion and stuck with it. Either Will gets cursed and is forced to command the Dutchman for eternity, or he and Elizabeth live happily ever after.
If they simply stuck with the filmed ending (instead of the after credits scene) at least they could have had a story for Pirates 4, if they make it. This way, as Lea27 says, what will they do? Make everyone ten years older for the next one?
I'm guessing if they bother to bring Will and Elizabeth back, they will just forget about this extra scene.