In the spirit of the original list:

• Lyndon LaRouche
  
• Time travel
  
• Unicorn disclosure

More seriously:

• Aquifer depletion and water shortages
• Increasing oil prices
• Decreasing renewable energy prices
• Automated warfare
• Climate change
• Additive manufacturing
• The end of Moore's Law and failure-to-materialize of the Technological Singularity*
• Global convergence of material standards of living

Far more speculative, but not impossible and certainly disruptive if they come to pass:

• Molecular manufacturing as in Drexler's Engines of Creation
• Increasing the overall human life span or just finding a way to keep people healthy and productive up until death
• Nuclear war, even a "little" one like between Pakistan and India

*This is more of a refutation of another popular megatrend idea than a trend in itself