That's an interesting question.
I guess some will defect to the Lib Dems and some to Labour.
Some may be discussing starting up a new party - who knows?
The trouble with a new party/new name is that the "Green Party" is active in Europe as well so really it would make more sense to ditch Zack for a more intelligent leader who actually DOES care about environmental issues, and save the soul of the Green party of England & Wales.