A pretty interesting subject I posted on the WoW official EU forums a while ago.
Seeing as these forums share more thoughts than forums limited to Europe I'd like to see what answers I get here
So anyway, let's post the possibilities I found so far:
- Aliens: Might sound absurd, but it's still possible. Even Steven Hawkin stated that we shouldn't draw the attention of aliens because they might attack our planet for our resources.
I don't really know if they want our already used resources though, I don't really know if they need lumber and oil will probably be replaced by something far more powerful. Maybe they might attack us for the water, but still I don't know if it's worth the trouble for them.
- Disease: As some stated on the EU forums, some bacteria might evolve till they are immune against Anti Biotic. We'll probably find more powerful medicines then though.
- Natural disaster: 2012 like scenario. Biggest disaster would be an asteroid impact. Still, I don't really think this is going to happen, and if it will happen. Then our species will definitely won't just sit and watch how the massive chunk of a failed planet destroys us.
- Humans themselves: Pretty easy to understand. We nuke each other till we all die. Probably this won't happen because our leaders probably want to live as well.
If you know any other scenarios, please post them