I may not understand what "everlasting dissolution" or "open theism" are. I only look at the OP question and answer in my simple way as a very new Christian.
So the question was "what about people who never hear about Jesus? Do they simply go to hell for their ignorance?" I am curious about this as well as what about those who do not know God exists? Let's consider the Old Testament. They did not know about Salvation or Jesus Christ. Those of the Old Testament days were not saved through faith. Were they saved by following the Law?
(Romans 1:20 (NKJV) For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse, .
Those such as Moses, Noah and Abraham for example, God spoke with. They knew He existed. They chose to believe and to follow the commandments, the Law.
Could it not be possible that there were those who did not know God existed, even then? This is where I am confused by Romans 1:20. Is this verse telling us that ALL knew, regardless if God spoke to them or not?
As for those who do not know Jesus, or have not heard the Good News...
Romans 10:14-15
How then shall they call on Him in whom they have not believed? And how shall they believe in Him of whom they have not heard? And how shall they hear without a preacher? And how shall they preach unless they are sent? As it is written: How beautiful are the feet of those who preach the gospel of peace, Who bring glad tidings of good things!
Romans 15:21 but as it is written:
To whom He was not announced, they shall see;
And those who have not heard shall understand.
Paul is telling us that for even those who do not know, if they are to be made to understand then, having that knowledge, gives them their choice to accept or reject Salvation.
I am still uncertain on my interpretations here. Sounds like a study of this, for me, is in order.
Peace.