"I propose that, instead of three branches of government, we adopt three (or more) completely independent and non-territorial governments. I make this proposal because it is not the concept of checks and balances that has failed, but the inadequacy of the particular system in place that is the source of our problems. I know this is a radical proposal, but no more radical than the constitutional republic that we live under now was when it was first proposed. A radical solution is called for because, in my opinion, attempts at incremental reforms have been no more effective than efforts to liberalize the mafia or the Ku Klux Klan would be. It is simply not in the nature of a territorial or monopoly state to relinquish its power or operate in a non-coercive fashion."
Not a good idea. As Ayn Rand pointed out in the 60s (yes, I'm quoting Rand: she wasn't totally loony), what do you get with "competing governments," which is what happens when you have governments seeking to increase their power base, i.e., population and commerce.