Well, IMHO it would not be so bad if both OSM and Wikivoyage can benefit from each other.
But about correct licence and data use there might be several deep points needed to be clarified.
I am not sure whethet the http://wiki.openstreetmap.org/wiki/Data_working_group is the right one to get a focus on that topic, maybe http://wiki.openstreetmap.org/wiki/LWG is a better place.
Or ask at the “legal-talk OSM mailing list” according to http://wiki.openstreetmap.org/wiki/Mailing_lists