I am sorry, but the reasoning here presented is about as Unanglican as possible. The communion exist only because the CoE separated from Rome, and that separation occured over one basic issue, namely whether final authority within the church rested on a national or an international (in that case Rome) level. To pretend that if the international authority had been more democratic, the outcome would have been somehow acceptable is nonsense. If instead of the Pope, a communion had ignored Henry's request, or had excommunicated Elizabeth, the end result would have been the same and you know it. The reason Anglicanism exists in the first place is the belief that the final church authority existed within the nation state. If the communion is to be what has been suggested here, then, at least, let us be honest about it and call it what it will be, namely the "Unanglican Communion". I sincerely hope the North American churches never agree to this.
I'm sorry, but that's not the whole picture. Cranmer explicitly talks about "matters indifferent" (his phrase for adiaphora) and things that are not - things on which we have to agree. Where a topic falls within the former the national church has the authority to decide, but not the latter; it was never that the national church had the authority to decide anything it liked.
If you can't cope with what the wider community decides are and are not adiaphora and you go a different way to the rest of the community then you are doing what Cranmer's church did w.r.t Rome - breaking away from it because you understand it to be wrong about some fundamental issue(s). Cranmer's church went well beyond what it said the national church should have the authority to decide because it understood the Catholic Church to have got non-adiaphora wrong.
Anglicanism has never been "anything goes", but it has been about minimal structures, miminal dogmatics, maximal adiaphora, and relying on bonds of affection and self-restraint rather than sanctions to maintain those limits of community. So, for example, Sydney desparately wants to allow lay presidency at communion, but (so far) has restrained because it understands that there would be consequences for the relationship with the rest of the Communion if it goes that route. But when that self-restraint doesn't do the job and one or more members act in ways that the rest say "do this and it fundamentally damages the relationship", then the Communion is
forced to change in character in some way - either by falling apart, or by becoming a less meaningful structure, or by those members who want to making more binding committment to each other.
The actions of TEC (and Canada possibly), and the response from Rwanda, Nigeria and Southern Cone, have changed the nature of the relationships. It would be impossible for the nature of the Communion not to change somewhat in response to that.
In a community of relationships you can just do whatever you want and expect that not to have consequences for the relationships.