and I think the consensus there was quite clear and still stands - "Wikipedia sources should be supported"
by creating items for each source (and for authors where necessary) - and create them in the main Q namespace, not in a separate namespace. So I think we are on solid ground proceeding with importing all wikipedia source data based on what the wikidata community has already decided.
Note that there were some specifics that may have an impact:
* for books an item for each book and (if necessary) each specific source edition used
* for scholarly, newspaper or magazine articles or similar entities an item for each article as well as for (and linked to) the journal/publisher
* for database entries, item is for database as a whole, reference should specify the exact entry
* but do NOT create items for individual web pages (reference URLs) - if part of a major website with an item that should be linked with "part of".