[quote=@t2wave]
I think you misunderstand. All the established heroes have disappeared without explanation. Nothing was disbanded they have just vanished. So now all the unknowns are coming out and needing to pick up the slack.
[/quote]
So, okay, how has the world not descended into utter chaos given that all the supervillains are still around? The DCU is permanently teetering on the brink of destruction already, and now literally every established hero on the entire planet has disappeared? 

How are, for example, Gotham and Vanity City still functioning in the slightest? Has Atlantis been taken over by Orm? How have the Thangarians not enslaved the human race? Is Paris still a giant warp in space since nobody was able to stop the Brotherhood of Dada?

And one can't just retcon out the b-listers. That fundamentally changes the entire setting to the extent that it lacks even the most tenuous links to the DCU. Without Steel making Eradicator reform the entire world would be wiped out by the second iteration of Doomsday, for example. In short, without b-listers, the setting doesn't work and the world gets exploded several dozen times over. I mean that was like the entire point of 52.