Given that the demons have worked over time for the last 70 since Roswell 1947, just a couple of years after the first atomic bombs were actually used on people, to impersonate aliens, I am convinced they will "stage" an "alien" intervention and they will take credit for the miraculous "cutting short" of the GT! I say convinced....I mean given what they have done in the past, coming to the earth before the flood, etc, I think it's a definite possibility.
I think this is a very distinct possibility, however I have speculated that when the 8th King arises they will engage in a purge of anyone who opposes them, and when they think they have succeeded, and the 8th King thinks his Kingdom has been established permanently, after the destruction of religion by creating a One World religion, then they will declare their "peace and security." Possibly or rather very likely if I am right about this, right after they executed the "Two Witnesses." In other words they establish their One World Religion and simultaneously, they kill the "remnant" "Christ's Brothers" , and they declare victory when they say "peace and security."