(2) In proceedings described by subsection (1) of this section, the boundary commission shall determine whether the affected territory shall be included in a new city, new metropolitan service district or new county service district or annexed to an existing district. The final order of the commission shall conclude the proceedings for all purposes; and the formation or annexation approved and ordered by the commission shall take effect 45 days after the date the commission adopts the final order in the proceeding. [1973 c.361 §16; 1989 c.92 §25; 2009 c.595 §179]