There’s nothing obsolete about devolving power from top level political units or splitting them up into politically more homogenous units. Political units that are too big and too diverse are bad for democracy, because nobody likes to be governed by people who are different (on whatever metric is relevant) from themselves. We just had the UK break apart from the EU. We will probably see Scotland break away from the UK soon. Spain, which is a unitary republic unlike the US, has 17 different autonomous units.
Nonsense. We are LITERALLY talking about the Electoral College, which, the last time I looked, was still in existence. "John C. Calhoun" has nothing to do with it.
In any case, the exact same rationale for the Electoral College still exists: small states don't want to be bullied by large ones.
Since getting rid of the Electoral College would require a constitutional amendment, and there's no way one of those is going to pass without the support of the smaller states, it is Never. Going. To. Happen.
The 1830s are calling and want you back; South Carolina's John C. Calhoun wants to enlist you in his nullification campaign.