Addison
Auror
To me, a subplot's life and death doesn't depend so much as the subplot itself but its connection and purpose to the main story and its memorability of either characters and/or plot.
Some subplots actually don't need to be presented as entire little....yarns that have a definitve, bold color and take away from the main story. If a subplot is a character's struggle with drinking, snorting fairy dust or resisting illegally using magic to heal their bum leg, you don't need to create all new characters or settings to set the stage. Events and their outcomes can help highlight or illustrate the struggle.
Some subplots actually don't need to be presented as entire little....yarns that have a definitve, bold color and take away from the main story. If a subplot is a character's struggle with drinking, snorting fairy dust or resisting illegally using magic to heal their bum leg, you don't need to create all new characters or settings to set the stage. Events and their outcomes can help highlight or illustrate the struggle.