The beauty in the fork/pr model would be that people who claim that they would be better stewards of a given topic could simply try to convince by example (in their fork), even in the hottest edit war. The current wikipedia model, as far as I understand it (which isn't far at all I admit), is that if a battle gets too hot it ends with a competition in pulling rank: escalating lockdown until only one group remains (a group that may or may not be considered neutral by others - certainly considers itself neutral, but who doesn't...). Fork/pr could never have a problem editors that are respected/neutral in one field but turn out to be zealous in some other niche.