I would add, "7. Trump and his cronies will do anything to stay in power." Meaning seeking foreign assistance (Hello, Vladimir). Meaning leveraging Republican power in states to tip the election scales (Hello, Katherine Harris). Meaning gaslighting the election results (Already claiming it's rigged in July). Meaning closing the USPS (Good-bye, mail-in voting). Meaning declaring a state of emergency after the election results come in due to some trumped-up charge (Anarchists in Portland).
Do you really see Donald T. standing before a microphone the evening of November 3 and saying, "My opponent ran a worthwhile campaign. I humbly concede the election." Not happening. It's just not part of his DNA. He's going to cook up some November surprise and it's going to require John Roberts, Mitt Romney, and a few other responsible Republicans to fight back Mitch McConnell, William Barr, and the other spineless Republicans for whom power is more important than the fate of the Republic.