User blog comment:AYET/The yet-unknowns/@comment-184.36.98.190-20130104193244

I think Madame Sharley's prediction has to do with the future. Luffy is gonna raise hell somewhere and destroy something big but not because he has bad intentions. Probably along the lines of him fighting an enemy and it was a rough fight like Garp and Sengoku vs Shiki or Aokiji vs Akainu. The prediction and Law's comment about the Whitebeard War being a prelude is just maybe foreshadowing the end of the series where all hell breaks loose.