Hi Michael,
(I cannot speak on behalf of WMF, this is not official)
The plans for Wikidata are to carefully attribute sources of data, which comes much closer to what you need, i.e. 3rd party data are separatable. For the start the CC0 license has been chosen which gives you unlimited re-use rights, but other licenses may be supported later if needed. The discussion was to decide this only when the use cases start to come in.
The real data use is still to come, so far wikidata can really only do the interlanguage linking of wikipedia pages. The rest is being worked on right now.
Best
Gregor