No examples that have been stated as evidence that BNW or 1984 could happen actually exist on a large enough scale, or anywhere close to it, for the situations described in those books to come to be. And sorry, but "give us your guns or you will be shot!" doesn't actually work. Wars prove that. Really, there are way too many people who would remain hopeful even through 1984's world. And the book assumes that anyone in the Inner Party would want power and serve the party to do so. It does not account for selfish pricks that would screw with the system. Realistically, corrupt officials would be bad for a malicious government as well as a good government. As for BNW, sure the world controllers took over after WWIII, but how? There was a war, and so they say "we're in charge now"? How do you even begin to develop a system like that world wide? How do you get everyone to agree with its establishment, even with diminished population numbers?
And you forget, even today not everyone can get the level of luxury that people in BNW get, and people who like to be more independent are not nearly so harshly cast out from their community, if ever.
Both books take real situations to unrealistic extremes, and that's all there is to it.