How does Hebrews 8:11 fit into Eternal Damnationist Doctrine? ,
KJV:
"And they shall not teach every man his neighbour, and every man his brother, saying, Know the Lord: for all shall know me, from the least to the greatest".
It does not... fit into "Eternal Damnationist Doctrine". And I don't see how one could even link the two subjects.
Firstly, it sounds like you need to understand the difference between the wicked being raised to the "resurrection of damnation" at Christ's future return vs. the wicked going into the future "lake of fire" after Christ's future "thousand years" reign.
Per the end of Revelation 20, the abode of the wicked called "hell" (actually Hades) will go into the future "lake of fire" and be destroyed, the wicked along with it. Psalms 37 tells us the wicked will be literally destroyed, and no more. It even says we will look for them and not find them. It says they will consume away and be no more. That means total annihilation. After that future "lake of fire" event, God will bring His new heavens and a new earth time. The wicked won't see it.
But until that future time of destruction, the wicked are assigned to the abode called hell (Hades). And they will be raised to the "resurrection of damnation" at Christ's future coming, and will remain in that state all throughout Christ's future "thousand years" reign with His elect. Only at the end of that thousand years will their fate be determined, because some of them (of those still existing unsaved nations), will believe The Gospel preached to them during that "thousand years", and be saved by Lord Jesus.
Apostle Paul actually covered this difference between the two resurrection TYPES of John 5:28-29. In 1 Corinthians 15 Paul showed that all shall be changed, but that there are TWO changes one must go through to have eternal life in Christ Jesus. The wicked of the "resurrection of damnation" and wicked caught still alive when Jesus comes, will still have 'mortal' souls because of not believing on Jesus. They will still be subject to the "second death" (i.e., casting into the future "lake of fire" after the 1,000 years).