I don't know how God is going to wind up/deal with the unity issue in these end times.
BUT HE WILL. And, I suspect it will shock most all of us.
I suspect He will do it AVOIDING ALL OUR prescriptions, sensibilities, notions, pet doctrines, "requirements," 'minimals,' prissy-nesses, perspectives, standards, criteria, comfort zones, constructions on reality etc.
His ways really are higher than our ways. He really does NOT fit in any of our tidy boxes.
Then a false unity will occur with the growth of a great ecumenical church, headquartered in Rome (Rev.17)