Do you know what exactly is protected by IP rights?
- The name
- The Wherigo API
- The usage of "zones"
- Any GPS based adventure similar to Wherigo (by an abstract patent)
If there is not an abstract patent there would be option 3:
- Start with "Wherigo 2.0", but find another name, develop a whole new API but make the transition of old and development of new cartridges as easy as possible for developers. Release the API as public domain so there can be players where the foundation player cannot work. We will lose a lot of old cartridges, but if we are "good enough", at least most active developers will convert their old cartridges.
Also I do not understand why OpenWIG and Whereyougo is not sued into non-existence, as they use the WIG-API too.
I am interested in Wherigo development too. I adapted Whereyougo (open source version) to use my Bluetooth GPS mouse (only used by me - no release planned yet - as I cannot afford an army of lawyers to fight this ridiculous IP war) and could imagine to do further development in this area.