GREAT movie, SUCKY ending.

[KYGOTC]

I think it would have been at  least a good idea to show all the haunted souls that he killed go to rest or something like that.

But American Werewolf is a story about, and from the perspective of, one character: David Kessler.  To have the film continue beyond his death would be out of place, to say the least.  And as for the ghouls, I've always taken them to be figments of David's imagination.   Can dreams continue without the dreamer?  Can a story about an American werewolf in London continue without the American werewolf?

Thats a good way of looking at it. What if the gouls wernt even there? That would make the ending a whole lot better.