That's no going to be possible. Unless you put it in a different universe someone is going to move data from one to the other, and then everyone is going to do it. What is awesome is that the parts that need to migrate will and the parts that don't will use the legacy stuff. The planet will eventually be a hodgepodge of all sorts of systems using each other for maximum benefit each data flow going where it needs to in order to not be stopped (either by censorship, error, whatever).

The existence of a free network will make others much more free too. What is the point of trying to block something when it will simply move to the free net?