If Kasumi ever dies, I'm dropping DOA, I refuse to play a dead character. And I don't think it'd affect the storyline if she did die, the saga could still go on, it wouldn't just stop then and there. There's still Phase 4, clones running around, potential test subject Honoka for MIST, Lisa who had an ambiguous fate, the core tournament, etc. There's still a lot of loose ends they could realistically tie up.If Kasumi died it would be the end of DOA forever. She has to live.