What would be the purpose of bringing all the Anglican churches together? A consolidation of power and finances for those folks running it?
What else drives it?
I've talked a bit with Anglicans in other provinces at it seem clear that the desire for unity remains with the laity. And at least some clergy too.
It's likely true that there are those who would like to see the reunification so that they could be the ones running it, but that's not the only reason. The end goal is a new (reformed?) North American Anglican church, a member in the worldwide Anglican Communion.
It should help mission activity. Church planting is an area where coordination is vital. Whether there is full union or just agreement to coordiate efforts, folks shouldn't be stepping on each other's toes.
Seminary support is another area where there are economies of scale.
Finally, unity of the body should be an aspirational goal for all Christians.
What else drives it?
Homosexual agenda.