Russel has done much to rid the party of its fringe tag and made the Party a central pillar of the political progressive movement. His mind on economics is the strength the Party needs.
He will have been bitterly disappointed by the low vote at the election, and new blood is needed.
It opens questions up about how long Metiria intends to stay on for (hopefully forever).
The teaming up of Genter and Shaw would as the new leaders open up the Party to a larger step to the middle that Labour are rushing for.
That might be too ambitious, so the inner conclave of the Greens may decide a Hague leader with Met leaving in 18 months for Genter.