Presidents may be impeached, removed from office, or even die, but the system will never fail.
Unless the people themselves want to give up on democracy and… oh, I don't know, let's pick a random example out of thin air… storm government buildings to stop the process to keep their desired leader in power.
We all believe things that are poorly-supported by facts, possibly serving an agenda we don't understand, and are clearly stupid when viewed rationally and with better information.
I will not defend their actions, but I have some compassion for the well-meaning dupes, and I wish the legal process could neuter their manipulator-perpetrators.
I'm glad we have a system where people can vote to undo their bad decisions. Not "too bad, we're stuck with this guy for the next X years."
Of course they'll go on to make other bad decisions, but that's another story.