I can't see demarchy or meritocracy working. Demarchy seems to rely on the fact the regular people from the population will have the country's best interests at heart. I don't think that is the case. What will happen is people will make laws that represent their own interests. Another problem is that most people are stupid, or rather they aren't stupid but they are uninformed/misinformed and don't really have a desire to inform themselves. A scarily large portion or the population gets their opinions from whatever shitrag tabloid newspaper they read. I reckon you'd get a lot of laws discriminating against groups that are used as scapegoats for the problems in our society (muslims, asylum seekers and other immigrants, etc).
I think someone pointed out the problem with meritocracy. Who decides who has the best ability to rule? Who decides the criteria that people are judged under? The people chosen through the demarchy part of the government? Well then you'll just get people chosen who have the same views as the group that is randomly chosen. In fact what you'll have done is reinvent democracy, but with only a randomly chosen group voting. The examples of meritocracy in that article seem to be based upon a despotic leader assigning people based on merit, it which case you basically have a totalitarian (possibly oligarchic) government since those people will be chosen because they have the same beliefs as the leader.
W4RP3D: That may be the case, but isn't peak oil either here or rapidly approaching? In my opinion we aren't going to have viable alternatives for all the things oil is used for before the econimy is seriously hit by oil prices constantly rising much faster than we've seen before. That could easily cause a revolution.