The idea of connected open virtual cities could be realized very fast. Sony is working on common platform for all online games, where user creates one own avatar and can switch to different virtual worlds. I think it is beginning of defining and building one platform which connects all virtual worlds. The independent providers will create own cities which will compete for avatars. Each avatar will be able to choose the best for him world, from Warcraft worlds to second life. From fantasy to science fiction worlds. The platform could be also a right opportunity for try-economy, worlds where real companies tests new products on real world simulators.  

I think in near future the biggest internet content providers will fight for making own standard as the best one. I think, here can be only one winner. The possibility of revenue for other companies are in building virtual cities and making them most attractive for avatars. Avatars should pay for entry to virtual worlds. I see two levels of virtual taxes: common entry to the platform and all free worlds or cities. The popular cities probably will created own entry prices, paid monthly or pro virtual time unit…

Currently the virtual worlds and online games are more entertainment then real revenue platform. But the situation could change very fast.