I'm surprised this board is so calm. I've seen many people blowing gaskets elsewhere. Still, I say here what I did there:
My gut tells me it is not as permanent or as drastic as the Collective Comic Internet ID seems to believe. That's not how DC or Marvel works anymore. This is likely a storyline that will run its course and nothing more.
And I stand by my comment that they will not permanently renumber ACTION COMICS or DETECTIVE COMICS (probably not SUPERMAN or BATMAN, either). They are too historical.
Mike, if the heirs get the rights back, and I hope they do, this likely won't "run its course."