Should be fun when Harry show back up in earth system with a huge army of fanatically loyal troops and the super advanced weapons compared to the earth. It should be nearly imposable for any of his clone to truly betray him but they will have there own interpenetration of how to best serving him. Harry will take the best of the Jedi and Sith teachings and fuse them together. Rejecting the Jedi complete denial of emotions but not the Sith letting emotions free reign he will find himself more adaptable then both in war.
What will Dumbledore think a bought this army that has no reason to see him as anything as a bothersome old man. Even if Tom managed to take over the entire earth without destroying both the population and infrastructure could still not win against what Harry is bring along with him.
Think of this an army made up of individuals that are literally brothers and sisters armed with cutting edge weapons. Add for fun they have full force powers to use in battle. The question is what will the world governments do with this siting in orbit and they have no ability to really put up more then a token fight if Harry decides he wants the entire world.
One thing is I believe is that the Jedi where rendering themselves extinct by taking force users out of population as babies and not letting them breed any new generations. If some of the subtext in the movies is true the number of Jedi had been falling for years even before the clone wars. The clone wars just scattered them making them more vulnerable to over whelming attack. So what if it took several hundred droids or several dozen clones to kill a Jedi in the end it was a cheap way of killing one. Attrition warfare never favors groups like the Jedi of the old republic.