If this would happen it would be very good for Christian evangelization. Disunity among Christians has been one of the greatest of scandals to non-Christians who view Christianity from the outside. Unity between Rome and Protestantism has become just about impossible since Protestantism has as many doctrines as heads. The only significant hurdle between Rome and Eastern Orthodox is the Papacy which, of course, we won’t budge on since Christ gave the keys of authority to Peter alone. But if the Eastern Orthodox would reunite with us there’s always the possibility that in the future a bishop from the East could become the Pope. This can’t be possible as long as they remain split from us. Something for them to think about.