Topic: GIS - WMS, WFS, PGSQL
It is clear that your Online Maps product is by far the superior asset for showing maps on Unity.
However I believe there is a niche which you could still exploit further.
If you could include some type of WMS /WFS / WCS/ CSW protocol support it would allow your product to become the only Unity asset for GIS purposes.
Another feature would be adding PGSQL support to obtain live map data direct from this database.
Most GIS platforms will support WGS84 so could start initially using this CRS.
This would allow your product combined with other assets and unity to compete with the likes of ESRI's cityengine - http://www.esri.com/software/cityengine