First of all, this as turned into a ridiculous thread and yet i feel compelled to add a reponse.
It is ludicris to even think of the world wide eradication of all males (speaking theoretically or not) because it just will never happen.
At the risk of sounding hypocritical, If anything it would be the other way around, even if you feminist females don't like it, females have approx only 60% a males physical strength and at the most equal intelligence (i say at the most because in history all the 'geniuses' have been male-einstein,hawking,newton, even shakesphere).
However, i think both sexes play an important role in society and a world without either would be a dull place i am sure.
As a final point it would be amusing to see how females would cope with the manual work (construction etc..), i have worked in construction for years, my father even longer and have never once seen a female on site, and only an handfull behind the scenes.