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Stories that would be improved by polyamory:
Dracula: it's basically a novel of kitchen-table polyamory already, but this way someone might actually kiss Jack Seward.
A Midsummer Night's Dream: just let them all have an orgy at the end. I feel like they'd be into it. Puck's invited too if he wants.
Bridget Jones' Diary: why force a choice between Mark and Daniel if there was the option to have both?
Any Arthuriana: less cheating, more honesty, fewer duels, more snogging, everyone's a winner.
Stories that would be made worse by polyamory:
Wuthering Heights: dear God do not give Cathy and Heathcliff a reason to drag more people into their terrible relationship than are already involved.