Please, don't think about one wikipedia for all swiss-german dialects. That
would be the same thing like the Alemannic wikipedia: An uncommon mixture of
native dialects. Surely all Baseldytsch speakers understand the Züritüütsch
(zurich-german) speakers and vice versa.
And please tell me: Why is there already a Plattdüütsch wikipedia? And a
Lëtzebuergesch wikipedia? They also seem to be dialects (although
Lëtzebuergesch is official in Luxemburg). So, why shouldn't there be other
dialect wikipedias? In Swabian, in Bernese German, in Saxony-German?
And yes, Baseldytsch has ist own orthography and dictionary (which many
dialects don't). I think that's also an argument for this wikipedia. The
interface are already translated into Baseldytsch. So lets just put it
online under
bsd.wikipedia.org and we shall see how it'll be running and
what the reactions are. Then we can take it offline, or we just let it be in
its developpment to a useful encyclopedia.