Because of all the skins on merge and RGN along with varying ownership groups this can't really happen. It could happen with Aced, PDC, Carbon since they are owned by the same company. Juicy and Lock are not so that would be like running iTunes on an Android phone.

I wonder if PS/FTP will end up with a joint player pool eventually. The same concept as a network, players on the PS skin play with others on the FTP skin. You would have tens of thousands of players on at once. Server capacity is probably the gating factor.