Now I just want to do a summary of my opinions, and I hope pro-Cantonese Wikipedians can offer good and sensible answers to my doubts.
1) Cantonese is not a written language. It is a spoken dialect(or language, whatever you call it). The current Chinese Wikipedia is written in standard Chinese language, which can be read in Mandarin or Cantonese or whaever dialect you choose. Not everybody can speak Mandarin, but most Chinese can read standard Chinese written language. Therefore Cantonese Wikipedia should not exist because it is not a written language and Cantonese speakers can understand Chinese Wikipedia.
2) Even if Cantonese is, as some insist, a written language, it does not yet have a standardised writing system. There is not a definite grammar, not a definite set of distinct Cantonese characters to be used. It would be hard even for native Cantonese speakers to understand Cantonese articles that try to explain such sophiscated topics like Theory of Relativity.
3) It is not easy to write entirely in Cantonese, as some of you have already discovered. And neither has anyone written anything in Cantonese entirely that has been accepted by the general public.
4) Wikipedia is a serious collaborative encyclopedia project. We are not advocating the use of Cantonese as a written language. The fact is hardly anyone today write in Cantonese, and so let it be. It is not Wikipedia's responsibility to educate the public or to change their behaviours. If one day Cantonese has indeed become a widely accepted written language I would not oppose the set up of a Cantonese Wikipedia.
And lastly I just want to clarity Wikipedia's policy on setting up a new Wikipedia: if a group of native speakers want to set up a Wikipedia despite the fact that majority of the speakers of that language do not wish to do so, should we allow them to have a new Wikipedia? As in the case of Cantonese, even Hong Kongers are generally opposed to the idea, and should we still allow few advocates to have it?
[[User:Formulax]]