They will meet the fate planned for them.  1 Peter 2:8

Believer, You who have been Born Again, REMEMBER - your heavenly Father to whom you pray.... has no favorites. You will be judged or rewarded according to what you do. AND now that you have had "a taste" of the Lord's kindness..... (1 Peter 1-2:3)

It is impossible to "bring back" to repentance those.... "who were once enlightened"—those who "have experienced" the good things of heaven and "shared in" the Holy Spirit, THOSE WHO HAVE TASTED "the goodness of the Word of God" and the power of the age to come— and who then.... "turn away" from God. It is impossible to bring such people back to repentance; (to repent again) by rejecting the Son of God, they themselves (personally) are nailing Him to the cross once again and holding Him up to public shame. (Hebrews 6:4-6)