Excellent list! Vacuum energy is my favorite! We can add to this mix, a few other mass extinction events, which could happen at any time, we know almost nothing about, and have happened frequently in the recent past. Such things are; 1. Super Volcanoes 2. Magnetic Pole shift 3. Massive hyper-onset super ice age 4. Comet or Asteroid impact 5. Mass Planktonic extinction 6. Random blasts of cosmic radiation 7. Super massive Solar flares 8. Super spontaneous global warming 9. World wide incurable pathogen outbreak 10.Tectonic plate reversal 11. Global Typhoons Which I suppose makes the times we are living in to be one of the calmest in thousands, perhaps millions of years... ..almost..too quiet....