There is no universal reconciliation.
The Bible, the Word of the living God, does not speak of universal reconciliation.
God's "reconciliation" to Himself is Jesus the Christ, the only begotten Son of the living God. Jesus the Christ can only reconcile us to God Almighty when we repent and cry out to God for forgiveness through His only begotten Son. There is no other way to God.
It is written.
How, then, do you reconcile a loving God with an eternal hell?
What kind of parent writes his or her child off for eternity?
What kind of parent employs punishment that does not rehabilitate (as a punishment of eternal duration with no hope of reconciliation is clearly not one geared toward rehabilitation)?
This is not the love we find of the father of the prodigal son.
Every knee will bow, on heaven and earth and under the earth, and every tongue confess that Jesus is Lord to the glory of God the Father. Doesn't say that every tongue will 'speak'. Doesn't say that every tongue will 'lash'. Says 'confess'. What more does it take than the confession of Jesus as Lord (where 'confess' often refers to a whole-hearted recognition of the true status of Jesus and of self)?
Why can't Jesus' sacrifice be applied or accepted after death? Is it not powerful enough?
Why are Christians so willing to accept 'free will' as a reason for God to allow hell? Is free will somehow more beautiful than the eternal happiness of all?
Why are Christian so willing to accept that God desires love resulting from free will, and that He is willing to sacrifice some (indeed, very many) of his children to hell in order to achieve this kind of love? That is the vision of a selfish God, not one who loves and wants the best for all.
Why must Jesus' sacrifice be accepted at all? Is it not powerful enough without the inclusion of free will?
Who, when properly and fully recognizing the status of oneself and God and all eternity, would choose hell over heaven? Hell, or Satan, or sin, is only chosen out of ignorance. What kind of a loving parent punishes his or her child for ignorance?
There must be an end to the punishment, or God is not loving, and not worthy of praise.