I think the answer to reconciling libertarian freedom with God’s “check mate” or “trump card” lies buried in two ideas: a) it is only through our free will being exercised that we develop an identity and that our “I’s” become real objective facts. Since this is the case, it cannot be denied that the very trump card itself is only brought about by the exercise of our free will; and b) the choice which is prompted by the trump card involves seeing the horror of the acts of the old self and repudiating it. In this way the choice for God may, indeed, be a compatibilist choice, or perhaps there is at that point no choice at all - maybe the last real “choice” a free being makes is a last rejection of God, and that prompts a transformation. Sin eventually sins itself out of existence. Like a fire that cannot last forever, all that is not divine eventually dies.
Perhaps libertarian free choice - whether sinful or good - of necessity gives way to compatibilistic freedom. When we become virtuous, we actually become in a sense less free to be bad. Our libertarian choices have a sort of complimentary effect or state that is not itself free, but imposed. Maybe the trump card is the ultimate imposition, based on the free willed choice of the creature, of rational light or knowledge that leads to the final “building” of a being who now hates and could never any more commit sin?
Perhaps, then, Talbott is right in saying that the scope of our free will does not extend to the fact that we will spend an eternity with God. Perhaps the exercise of free will simply (I am not discounting it!) provides the context in which we as “selves” experience that process.
Edit There may be a worry that the trump card leads to the conclusion that it is not really the “I” who can identifiably say that they have “come to God.” I think people like Jerry Walls and Greg Boyd would say that acts can’t have purpose or meaning from an agent unless that agent makes them freely, and that this is the main reason they see for not accepting Universalism. The argument runs shortly: the most meaningful acts are free acts; indeed, we are only “real” (as opposed to puppets) insofar as we act freely; God would rather have real people than puppets; therefore, to really be united to God requires the free act of loving him, etc. I’m not sure how to address this objection. I will say, however, that if God is total love, his desire for the beatification of his creatures (who have already become “real” through exercise of free will) may override his, so to speak, “pride” in wanting them to come to him “freely” or “on their own.”
Thoughts?