@cstross ...or just ban future presidents? Full stop.
Consider: the two biggest problems in the world today are named Trump and Putin, and they seem to be besties. (Xi Jinping, Modi and whoever Brazil installs aren't squeaky clean, but haven't been problems on the same scale (yet).)
No individual should have the authority these bros do. No one from any party. Ever.
No individual should even be allowed to speak, let alone act, for millions. Ever.
Humanity has created something in its governments that biology doesn't allow to exist in ecosystems: localizing the potential for catastrophe in one individual.
There's your Great Filter.
@kramaker Presidencies (and similar unitary individual executives) are just a reified non-hereditary replacement for the monarchs of yore. They can, in principal, be replaced more easily when they crap out. But in practice, if it deteriorates into oligarchy we're fucked the same way. And they always try to accumulate more centralized power.
The EU at least has a rotating chair held by whichever nation has the baton and it's not really about exercising king-like individual power.