I think it would take more than any one single disaster. It would take a slam. And then it would be a pick and choose who to help. Or if the country who usually does the aiding was slammed theirselves along with another country, they wouldn't have the resources to help both.

I don't see anyone just throwing up their hands and saying "Oh well, they're too damaged to help" over a single disaster. I mean look at how many countries were affected by the tsunami.

However, if you take the countries that do the aiding and slam them, I somehow don't see the countries that don't usually get involved in these other disasters suddenly jumping in the role.