I foresee a counsel of Florence fesaco, with some of the Orthodox falling for the false unity and many not, then the strays returning home. There are also far bigger things to deal with in restoring unity than the date Pascha, and without that it is not true unity.
We have to remember that it is not the bishops only who will need persuading, but the monastics (especially the athonites) and the grandmothers of the Church will be the mountain which will not move, that with many other of the faithful who will object on principle to the change. Then there is the mirical of Holy fire to take into account, since if that is lost due to changing the date of pascha the people of the church would not be pleased.
I think one of the best things we can do is pray to the fathers of the Church to help us in this time, especially Mark of Ephesus with his involvement in holding the Church together last time.
In the end we must ask ourselves do we know Christ better than the fathers of the Church who wrote the rules for dating Pasha.
Another separate discussion, is do we correct the calendar to the observable phonomona of the the universe? If we do decide to put the calendar in sink with the sun, moon and stars, we may as well put the 25th of March on the observable spring equinox as it was in the time of Christ, then we would be 2 days ahead of the secular calendar.