Not interested in the "personal commentary." These 3 groups have always existed. I don't require a Bible verse to prove the sun will go down at night and will come up in the morning. Neither do I need a Bible verse to prove that right now in the world these 3 classes of people presently exist, those who have accepted the Gospel, those who have rejected the Gospel, and those to whom we're commissioned to preach the Gospel.
I assume these conditions exist all the way until the end of the age, until the very last day of the age. Jesus said :
Matt 10.23 Truly I tell you, you will not finish going through the towns of Israel before the Son of Man comes.
Now, I don't believe this actually refers to the 2nd Coming, but regardless, there is a principle that not everyone will be adequately prepared for Christ's judgment against society.
I don't need to prove that there are Christians up until the end of the age, when they will be glorified and rewarded. And I don't need to prove that the wicked will reject Christ all the way up until the last day of the age, since that is when Antichrist is judged.