Ou're assuming the Greens want anything to do with the NDP in the first place. Many of the odd ducks that are involved in that party will breathlessly tell you that they are NOT leftwing at all and that they hate unions just as much as the next guy! On environmental policy, you practicaly need a microscope to find any difference between the NDP and the greens in the first place. And then there are the massive egos involved. EMay could never be involved in anything she didn't run.

Better to just let the greens turn brown, wither and die and then pick up any flotsam remaining.