Prolog: I think they will just use the same reasoning they always have.
It is a slight variation of the Repentant Ninivites:
"Jehovaha has is own time table and as long as there are honest-hearted ones, he will delay, ( then they quote that one scripture about God not wanting to destroy but wants everyone to attain repentance).
And if we are being impatient because it hasn't happened yet,we are unloving and being selfish (like Jonah) because who knows how many more will discover Jehovahs loving kindness and be saved from the destruction. "
So they aren't saying it won't happen, just that Jehovah isn't quite ready yet.