Fox News reports that Iran is building their own internet because the current one isn't to their government's liking what with all the free thinking going on. Yeah I'm sure that'll work just 'fine'.
When will governments (and businesses for that matter) learn, it's too late. The cat's already out of the bag with regards to online. The more you tell people 'no', the harder they'll try to get around you. The more security you put in place to stop them, the more innovative they'll become to circumvent it.
There have already been many reported protests across the world with regards to tampering with online access (see France and their 3 strikes law). In Egypt, cutting off internet access, was apparently the last item in a long list of grievances that caused them to rise up against their government. I'm sure it's only a matter of time before there's a full scale rebellion somewhere in the world based entirely on a government's attempt at online censorship.