Hi all,
All political, sociolinguistic, and practical arguments aside, there are currently 29 votes in support of a separate Cantonese Wikipedia and 6 against (http://meta.wikimedia.org/wiki/Proposal_for_Sinitic_linguistic_policy#Vote_-...).
While it's been said that Wikipedia isn't nessecarily a democracy, and people have questioned the expertise of people who have given their input on the issue of Cantonese, I think that the fact that the vote so far is 29 to 6 against for the creation of a separate Cantonese Wikipedia (a good portion of the votes on either side cast by native speakers) should be enough to support the unconditional creation of a Cantonese Wikipedia in the very very very near future.
Mark