Given one of my very first sentence in my initial post was "The Cabal saved their Earth and both universes, yes. ", I don't see why you paint me as "mistaken"...
Also, yes, if 616 saves the day, then your statement will prove to be correct and just.
At this point of the story however, it's both false and arrogant to presume only 616 can solve the problem of Incursions, when we know an infinite number of universes, each with its sets of geniuses,super-beings and cosmical entities, are being involved.
It's too absolute a statement to make.