would tighter integration between Wikidata and OSM help with this situation
Yes of course!
The licenses are incompatible.
May be - but in OSM it is common sense, that coordinates are *facts* which are not involved/infected by copyrights :-)
OSM is the most accurate and biggest free DB about coordinates. So it is the best source for the WM-space. Cooperation and data sharing between OSM and WM is a "must"...
If there is a difficulty concerning definitions, the WMF and the OSMF have to solve together it in a better way :-)
Bests, Markus