I doubt any outside force can take out the borg, they keep adapting... Think about it:
If conditions in the world get worse, it's a sign of the last days, but if conditions in the world improve, it's a sign of peace and security which means the end is near.
If numbers grow it's a sign that Jehovah is blessing their efforts, but if they stop growing it's a sign that the number of right hearted people is dwindling, so the end must be near.
If they get something right ( Like they claim they did about 1914, but that's a subject all by itself.) It proves that they are Jehovahs chosen religion... Praise God. But if they get stuff wrong and then correct it, it's a sign that Jehovah has given them 'New Light' Praise God again!
If scientists discover things that seem to support the bible, it is accepted right away as fact and they praise god for the wonderfull truth. But if scientists discover things that disprove the bible, it is evidence of Satan trying to deceive them, so they must draw closer to god and so the scripture about not putting trust in nobles is proven true, and they praise god for the wonderfull truth.
If someone comes into the borg it is evidence that god is helping them grow, but if someone leaves the borg it is evidence that god is helping them get rid of imposters.
If they are under ban it is evidence that Satan is persecuting them, but if the ban is lifted it is evidence of gods protection.
It's pathetic! No matter what happens their faith is strengthened, and if the same things happen to other religions it is taken as evidence against them! They can't lose... the only thing that can stop them is themselves, the individual witness has to pull his head out of his butt and start thinking... but they don't since the collective mind thinks for them.
LtCmd.Lore