The centuries-old political climate in which the electoral college was born has little if any bearing on its utility for the modern United States. I doubt the only thing keeping rural states in the union now is leverage against abolitionists.
It's because tyranny of the minority means prevention against new laws, not the enactment of them. It's the safer path, generally not absolutely. A bias towards inaction.
Tyranny of the minority only means prevention of laws the minority disagrees with. That minority hasn't, historically, taken issue with new laws that cater to them.
