Thats not what you were saying, anyhow anyone can read your post, so I need not say more.
To answer you, you need enough nodes to form a section. And no way are you going to run a global network on a single server computer. Nor even if you make every computer in any one commercial data centre into (multiple) vaults.
Your argument equates to the old argument of how many angels can you fit on the head of a pin, pure word play.