Do you think it destroys any evil Digimon sucked into it or just seals them away? They never really specified it in the show, aside from MagnaAngemon implying the former in Season 2, but as the writers of that season didn't work well together or stay consistent, that might not be valid.
Of course, I am inclined to think it destroys them, they said all the Dark Masters have to be eliminated, the way the portal disintegrated seemed to be Piedmon's death from the way it was played, and with Spiral Mountain and all, and MagnaAngemon also called it "devastating".
I remember hearing there was a scene in the manga where someone breaks out, so if it does kill them the point of death is when it dissolves.
This has been debated of course, so I'm wondering what your thoughts are.
Of course, Piedmon is dead either way - even if he was just sealed away in a Dead Zone or something, we saw all of Apocalymon's creations died along with him, and the Dark Masters were explicitly stated to be four of those creations. So in the long run it doesn't make a huge difference.