This is what my teacher teaches.
John 10:16 "I have other sheep, which are not of this fold; I must bring them also, and they will hear My voice; and they will become one flock with one shepherd.
Yes they will be brought into Gods kingdom. It says nothing about the great multitude going to heaven. Gods kingdom is coming to earth. Jesus taught us to pray for that in the Lords prayer. That is why Jesus taught--Matt 5:5--Blessed are the meek for they will inherit the earth. He was speaking to the great multitude-
Proverbs 2:21-22--The blameless, and upright( righteous) will be left over on the Earth
Matt 24:22--Unless those days( Har-mageddon) were cut short, no flesh would be saved.
Since all know the unrighteous will not be saved. it has to be the great multitude this is speaking of.