This isn't happening in the US...yet. I'm fairly confident that not only will the arrangement for accounting and bill payment switch to the branch office handling routine expenses but as it is in many countries, ownership and management of Kingdom Halls (build/operate/remodel/decommission) is handled more directly to the branch office and out of local hands.
An arrangement of this type does cut out a huge amount of complexity for the branch in dealing with the local brothers...but the local bodies of elders will really just be told what will happen with expenses and with KHs. This will be a monumental shift for most all the brothers. Very few will be comfortable with this.
I expect this move in the US to occur within 18 months.