Memes ( in the Dawkins/Darwinian sense ) are subject to random mutation and natural selection just as genes are. I would rather see the meme of
permaculture prove itself "fittest" as opposed to fast. Game theory could be utilized to find the Evolutionary Stable Strategies. The angry memes scenario reminds me of the Hawks/Dove/Retaliator scenarios .
http://en.wikipedia.org/wiki/Evolutionary_game_theory
Dawkins outlies variants of the Prisoners Dilemma :
Some become ESS and some don't. I think Retaliating Doves would be a good strategy for permies. Hope this makes sense.