That was your paraphrase of John 3:17, "For God sent not his Son into the world to condemn the world; but that the world through him might be saved."
Now read the verse 18, "He that believeth on him is not condemned:
but he that believeth not is condemned already, because he hath not believed in the name of the only begotten Son of God".
And going back to vss.15-16, "
That whosoever believeth in him should not perish, but have eternal life. For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. "
That's right. BUT, you're conveniently omitting John's intended audience and, hence, the thrust of the teaching.
John starts his history of the life of Jesus to/with the audience being the world's population. He is answering the question asked by Jesus of the twelve--
John 6:69,
"And we believe and are sure that thou art that Christ, the Son of the living God." and John 1:1-4,
"In the beginning was the Word, and the Word was with God, and the Word was God.
The same was in the beginning with God. All things were made by him; and without him was not any thing made that was made. In him was life; and the life was the light of men. "
That coupled with their mission--John 20:21, "Then said Jesus to them again, Peace be unto you:
as my Father hath sent me, even so send I you".
Jesus came to the "lost sheep of Israel"---they were the ones who were supposed to have carried the salvation to all the world--and failed. Now, since the Israelites had refused their awaited for Messiah--Jesus. The messages was to go by way of the Apostles to all the world. Those who accept their message of Salvation is/was to continue to spread the life giving truths of the message.
The condemnation is still to all who refuse to accept the "life giving truths" of the Message---It has NOT Changed.
Yes, GOD is "long-suffering" and desires all to Repent and submit, but the Fruit of those who have departed echo's the "examples which were written for our admonition"---and GOD destroyed the rebellious/defiant/ evil Beings.
No, I have no knowledge of who will "believe" and surrender to the pleading of the Holy Spirit in their last moments of life. But I do know that when life ceases, the Scriptures declare one's reward to be had is determined.
Because GOD is Merciful and forgiving does NOT equate to "all will be saved" into the Kingdom. GOD will not allow those who have not surrendered their will to be in agreement to the Father's to again bring disharmony into the "Earth made new". NOR will GOD force anyone to be a robot without that freedom to choose.
Therefore, All that are admitted into the earth made new, will have in LOVE submitted their "all" to pleasing GOD.
Man shouldn't "assume"---GOD has stated and that will come to pass.
When the "fat lady sings", Earth's time will have ended and Rev.22:11-12, will be fact.
"He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still. And, behold, I come quickly; and my reward is with me, to give every man according as his work shall be."