By the sound of things it’s more like nobody wanted anything to do with the major-party incumbent. Duverger’s law is about how there tend to be two parties. Three and one are equally unstable. When a race becomes a total rout, like a 30-point spread, that dominance can be seen as a power vacuum.
… also, Sri Lanka has ranked ballots. It’s not a Plurality voting system. They have an automatic runoff. That’s one of the more obvious fixes that allows people to even consider supporting a third party, without playing Russian roulette against their own foot.
By the sound of things it’s more like nobody wanted anything to do with the major-party incumbent. Duverger’s law is about how there tend to be two parties. Three and one are equally unstable. When a race becomes a total rout, like a 30-point spread, that dominance can be seen as a power vacuum.
… also, Sri Lanka has ranked ballots. It’s not a Plurality voting system. They have an automatic runoff. That’s one of the more obvious fixes that allows people to even consider supporting a third party, without playing Russian roulette against their own foot.