This is where a lack of study of scriptures has failed the majority of the people!
When God starts something .. it Has to be accomplished!
What was God’s plan in the beginning?
A paradise earth that Man would live on forever.
It is true, there are a small number of humans that will inherit the kingdom of heaven, (a different discussion) but the following should be a clue to the ending.
Btw: A hint .. why would we call Jesus the second Adam?
God will completely undo all the bad that Satan has done.
God will make Jesus the King over all the earth.
Under his rulership, the earth will be made into a paradise.—Daniel 7:13, 14; Luke 23:43.
“The earth itself will certainly give its produce; God, our God, will bless us.” “There will come to be plenty of grain on the earth; on the top of the mountains there will be an overflow.”—Psalm 67:6; 72:16.
“At that time the eyes of the blind ones will be opened, and the very ears of the deaf ones will be unstopped.
At that time the lame one will climb up just as a stag does, and the tongue of the speechless one will cry out in gladness.”—Isaiah 35:5, 6.
“And God himself will be with them. And he will wipe out every tear from their eyes, and death will be no more, neither will mourning nor outcry nor pain be anymore. The former things have passed away.”—Revelation 21:3, 4.
There are plenty unanswered questions.
What about your loved ones who turned to the bad side,will your very memory be wiped so you no longer mourn or miss them?
Going to be a bit crowded with the billions who have ever lived?
Beloved pets?
What challenges to stave off boredom ?
And many more questions we don’t even know enough to ask.