In this thread about the UK, Myglaren expresses a distaste for patriotism, and says that borders should be eradicated. I've of course heard this sentiment before, but seeing it here got me to thinking about the concept.
What would the world be like without borders? Would it be a better world than the one we live in now?
Is it attainable? In our lifetimes, or sometime in the future?
What political structure would/could there be?
Can people give up nationalism? Would other Isms rise in its place?
Any thoughts?