................... (btw I am not a Christian).
A 1000 year reign of the Christ over Earth may occur after his return, but I doubt if people will live that much longer than they do now. Life on Earth after the Christ returns will be much better, but not that different from now - just one of peace, justice and abundance.
But you are right about the 'goats' no longer being around. After the 1000 year reign (could be a bit longer), life will still continue as before, just without the Christ himself being on Earth (God will appoint someone else to take his place to rule on Earth).
At the end of the thousand years Jesus hands back God's Kingdom to his God - 1 Corinthians 15:24-26
Because ' enemy death ' will be No more, then people will live forever on Earth. - 1 Corinthians 15:26; Isaiah 25:8
( side note: what will end is; reproduction - Genesis 1:28 )
Once Earth is populated (full) Not over-populated/ Not over full is when reproduction will stop on Earth.
P.S. please note John 14:19 because Christ's return is Not physical but governing from the heavens over Earth.
Notice: it will be the 'sword-like executional words from Jesus' mouth' that will rid the Earth of the wicked.
- Isaiah 11:3-4; Revelation 19:14-15; Psalms 92:7; Psalms 104:35; Proverbs 2:21-22