That's a pessimistic reading. Firstly, there's no requirement for universal vendor support for the coding system to be useful. Obviously the motivation for sup

That's a pessimistic reading. Firstly, there's no requirement for universal vendor support for the coding system to be useful. Obviously the motivation for support is higher as is the critical mass of support, but it's not all or nothing. Secondly, by definition one can convert from existing lat/long values to this programmatically. The burden at either input or output end to support this is relatively low and can be calculated from existing data; frankly the greatest burden is in UI, which is hardly insurmountable. That said I'm still not necessarily persuaded this is the right idea or the best implementation, but I think you're overstating the barriers to adoption.