From a state security perspective, the "Balkanisation" of the internet makes perfect sense. You wouldn't allow huge numbers of unknown agents from other countries in, to spend their time trying to influence your people, yet there is a free and open internet with a practically direct connection the population's brains, and very little way to know who is doing the influencing.
Right, states have (and should) have absolute libery to block foreign connections. I feel uneasy about the idea that the internet should be completely open and global. First because if we think about most organisms and states and houses, they all form walls in order to protect themselves, open is synonymous with infections or intruders. Second because in the end it will never be global, it will just answer to those who have the most power, which happens to be those who created it (US of A).
