Not sure about Michelle. As far as I know, her only qualification is having lived with a president for what will be 8 years. All of your other choices, I would support. Especially Bernie Sanders. Problem is, VPs don't have squat for power, so not sure how much he could change if he/they got elected.
There is that. And if the prez were incapacitated, I wouldn't be worried if either Warren or Sanders were at the helm. I don't know much about Franken's record, but from what little I've seen, he would probably be fine, too.