#Wikipedia app on the #mobile is to give you everything that is near you. The question is, should it be based on Wikipedia or on Wikidata data. In order for software to find geo references, "magic words" need to be employed in Wikipedia. These same magic words can be used to harvest the information for Wikidata.
So what are the benefits of using Wikidata over Wikipedia with magic words .. Most importantly, there is only one Wikidata and there are 280+ Wikipedias. Everyone seeking information about subjects nearby is as entitled to great information as anyone else.
Wikidata does not have official query functionality. But it does have WDQ. Magnus and Yuvi are finishing the implementation of load balancing for WDQ. So the question is not can we serve geo coordinates from Wikidata but can we afford to let this opportunity slip us by.
PS There has been no evaluation of WDQ yet by WMF engineers.. Why not?