One thing that I have thought, ever since I was very young, about this universal sovereignty is.... after the 1000yrs of peace, Satan is let loose...... He succeeds in turning some away from Jehovah, so..... the issue of universal sovereignty is still not finished..... Satan could say people still choose his way..... the case will never close.
And if Jehovah's Witnesses are the one true religion, the issue of universal sovereignty is clearly being won by Satan..... I mean, the jury is still out, but it is not looking god for Jehovah..... people seem to be in favour of false religion.