He dismisses rank-choice but mostly because it will take too long to get it everywhere. To me, it seems the best way to allow all sorts of candidates to run, and will likely reduce the chances of the wacko extreme candidates we're getting today.
Finally, he mentions Yang's new Forward Party, which imho likely won't do much good, but has the potential of causing another Ralph Nader-esque impact on a future election. Although we can't tell what would have happened with a Gore presidency, I'm almost sure we would not have invaded Iraq. Let's all hope the Forward Party dies a quick and painless death.