Conversely, I feel the opposite. The longer I have players in a story line the more ammunition I develop for more embedding additional complexity. When they are eliminated from the story I have to start all over with providing foreshadowing and building NPC relationships for these new PCs. It gets even worse if they're prophesied in some fashion.

While I have nothing against the addition of Mortal Kombat derived characters I would appreciate avoiding the cartoon level of physics. For example, the idea of decapitating someone with a severed arm, flaccid or not, is preposterous outside of the original source material.