Advancing Between Kingdoms Afterward
Will those who are put in the lower of the three degrees of glory ever be allowed to move up to the celestial kingdom?
It isn't a question of not being allowed to move up. Our Heavenly Father seeks our total happiness. It would be his joy to have his sons and daughters home with him. But this would require us to change. That dreadful word "change." Everyone wants the rewards or avoid the costs but no one is interested in paying the price.
To rise above any kingdom a person must rise above the law of the kingdom they are in. Those in the Telestial Kingdom must abide the greater law of the Terrestial Kingdom _
"And he who cannot abide the law of a terrestrial kingdom cannot abide a terrestrial glory." D&C 88:23
God will make sure that all have every chance to change before it is all concluded.