Utopia would have one 'country' enveloping the world, too...but it's unlikely to happen.
Each Skinning site is an individual and will have tenets which differ from others...and that 'demand' separation and individuality.
The idea of one registration to join all won't work fundamentally because a person 'may' transgress one site's rules of conduct and be 'exiled' and find himself removed from all the sites...even when other sites may not agree with his 'transgression'.
The mechanics of 'unity' would be unweildy, more so than the efforts involved in simply joining each site separately...
