Actually that kind of sounds more like it. The final battle of X6 should have been fought in a wormhole of sorts. If X or Zero loses to Sigma then the whole world would be doomed.
Basically your kinda right on that one. That's the theme for the final battle of the whole X series. Takes place on the moon, against Lumine who has been controlling Sigma during the events of Mega Man X8, and has full control over every New Generation Reploid. The world would be literally f***ed over if X, Zero, and Axl lost to Lumine as Lumine had the power to destroy all humans, and old generation Reploids.