Well, it might teach a rationality concept that you don't always have to personally be the hero and its ok to ask for help. But as I said, I'm not saying this is how I think the story will end, nor how it should end, just that this would be a possibility if it was real.

He can apparate around and constantly make new horcruxes.

This is true, but whatever happens a way has to be found to deal with this problem, and having an army would buy time. Its also possible that once Voldie has fallen, feeding his wand to the dementors would work.

I think the secrecy is likely backed by a bunch of curses that aren't easily broken.

In canon I got the impression that the enforcement was conducted by the ministry of magic, rather than by ancient curses dating back to Merlin. But if the curses do exist, then this would stop my plan working.