> Its military has force projection to nearly every point on the globe, with hundreds of global military bases

How are the hosts to all those bases going to react when suddenly the guest acts belligerent? When the ally drops down to an occupier, that force projection suddenly starts looking like occupation, which becomes a lot more expensive to maintain.

And the expense has worked until now because everyone else has wanted our currency so what's a bit more currency printing, but when we kick our own global reserve currency status because we fucked all of our allies, well now that "force projections becomes a lot more expensive" actually becomes expensive^squared.

This is absolutely idiotic for anyone who indulges in the privileges of empire.