Sudan was cut off from the Internet for 25 days

It won't; e-government, e-schools and e-universities must have access to internet and on top of that e-commerce will become even more ubiquitous than it is today so it doesn't make sense to do it.

Governments can try to cut internet access to citizens while keeping it for themselves but then ordinary people would storm streets and request internet back.

Internet is how we communicate and trade in 21st century. Easier and cheaper than ever.