You assume that in John's vision, a playback of what has not yet happened, Hell is destroyed in the Lake of Fire. I believe that's not quite so. Yes, it ceases to exist as a separate entity, but fuses into a part of that which is of the same nature, only larger (and hotter?); similar to a glass of water being tossed into a river.
Death was also cast into the Lake of Fire, but was not destroyed, either; it retains its characteristic of being the overriding principle operating in the Lake of Fire.
You may say that those humans whose name was/is not written in the Book of Life will have a brief moment of respite at the moment they are rejoined to a corrupted body and fairly judged, just before they are thrown back into the hellish never-ending Lake of Fire to accompany the Beast (anti-god), the false prophet (anti-christ), Satan-dragon (anti-spirit), and all fallen angels.
But all this is not the motivating cause of salvation. It is only the basis for conviction, one's recognition and agreement with the sentence deserved for ones crimes against The God.
It is the yearning cry for mercy while it is available, upon which The God acts through the faith of Christ to save, IMHO.