Board Thread:Warhammer 40k General Discussion/@comment-8881468-20150204091114/@comment-14745711-20150205053649

It's like all great powers throughout history: once the box you're responsible for gets big enough, you can't plug all the holes at once, and you end up drowning. That will be the Imperium's end, simply the fact that they have to fight so many enemies at once. If any of their foes was trying to fight them alone (to my mind even the tyranids) would be defeated. In the case of the orks permanent extinction would be hard, but not impossible. The reason the Tyranids would lose is that they would just die as they came until they decided to go somewhere else.