DR will end in a few monthes but how?
who can stop norman?
CAP back to life organize a group consisting of the invaders, fury an spidey to confront osborn
it will seem to fail but somthing will happen to expose norman and send hi away replacing him with... D man! (well not realy but it will provably be with a good guy.
the sun will rise and the heroes rejoice until a new bad thing happen.
HOW would YOU do it?
Just an MU citizen wake up call would do it. The real heroes release a few tidbits of footage they've gathered. Venom eating prostitutes and others while the other Dark Avengers sit around and joke about it. Norman conferencing with the Cabal, Bullseye murdering scores of police officers. It wouldn't take much, just a spark for the population to realize they've been totally hoodwinked and come to their senses (maybe there's something in the water? Is Osborn using the amplified Overmind? Something needs to be making the public this malleable)
Once there you could have the obligatory big fight scene, but the real 'end' to Dark Reign is rooted in exposing the mass murderers posing as heroes.