[hypeatei]

> no mechanism in the constitution for canceling elections

Sure, but there's mechanism in real life that allows cancelling elections like sending your newly funded ICE goons to polling places. Ideally everyone follows the constitution but in reality (even looking at past administrations) there's nothing stopping the executive from taking an action and saying "oops guess we'll let the courts figure it out!"

[isthatafact]

I agree. Stability of a system is not so much about whether there is some mechanism or force that wants to push it away from equilibrium (because there probably is some such perturber outside of a perfectly controlled environment), but stability is more about whether there exists a stabilizing mechanism to bring the system back toward equilibrium after it starts to deviate.