I recently gave a talk at an engineering college. All the students and faculty knew and used En Wiki everyday. But none knew there is a Tamil wiki :(There is one simple way to spread awareness of Indic / language wikis. When I visit http://wordpress.com it flashes a message at the header that they have WordPress in Indian languages and links to those portals too.
Similarly, an IP based country detection script can be added to en wiki which will flash a similar message. This can even get better if the message can link to corresponding artilce (if existed) from language wikis in that country.
This is more important for countries like India which many languages. Can we agree on this and send a request / file a
feature request at bugzilla?