>>724175
>Will Catholic-Orthodox unity ever happen?
Step 1: Find common interpretation of the scriptures, the Fathers, and pre-schism history
Step 2: Find common interpretation of the relationship between clergy and laity
Step 3: See what should be done with doctrine that is currently defined as dogma by both sides
I personally think a dramatic re-interpretation of certain Roman Catholic doctrine will be needed. The filioque and Purgatory are actually on their way there, thanks to the 20th century patristic renewal that began with the edition of the Sources Chrétiennes. For unleavened bread for the Eucharist, I think it is the Orthodox who could make a detour and agree that unleavened bread can be used. Then there is the big issue of the Papacy… I have no clue how it could be solved, Vatican I was a big problem. God willing, our bishops will be enlightened by the Spirit to figure something out without throwing away the truth.
>Will Catholic-Protestant unity ever happen?
Anglicans, possibly, if they let go of their idiocies (gay marriage and ordination of women). Protestants generally have a very, very different starting point than Catholics on how to approach the faith though. I can only imagine Protestantism slowly crumbling as people convert to Catholicism.
>Will Abrahamic unity ever happen?
Jews will recognize their Messiah at the eschaton. As for Muslims, I have no clue - their whole tradition is founded upon a rejection of the Jesus that Christianity presents. I think they'll need to be converted one by one, they'll be counted among the pagan nations when the eschaton happens otherwise.