I would, of course, support the idea of a Kölsch Wikipedia, and would
point
out that there is, after all, one for plattdütsch (sp?) as well. There
are
also quite a few books in Kölsch, as well as an institute for learning
it. So
I see no problem there.
The difference is that Plattdüütsch is a language on its own while Kölsch is merely a dialect. If you want one Wikipedia in a German dialect, others will come and soon you'll have entries in Swabian, Bavarian, Saxon, Hessisch, Ruhrdeutsch and whatnot. I think that's a clear no here.
- André