I watched this yesterday and then did a bit of googling and discovered the book etc.
What did ring true for me was the way it was framed that the easiest way to conquer a country isn't by messy direct invasion, but by using technology to cripple infrastructure and using new weaponry such as the sonic attacks drones, radiation / microwaves to cause chaos - basically rely on human nature to cause a population to turn on itself, do all the dirty work then swoop in and impose a regime of any sort which would be sweet relief in comparison if it restored order and security.
It's fairly feasible I think, given the way governments are using psy op tactics. A bit of digging around the fringes of the Internet throws up all sorts of interesting stuff in terms of military research into ways to use new technology for surveillance and propaganda.
There's a YouTube channel called Truthstream Media that has some thoughtful stuff if anyone fancies following the white rabbit.
Ultimately I reckon the end of the world as we know it will be by collective nervous breakdown and we're halfway there lol.
Not convinced there's one cabal to rule us all, however, there are groups of people with various vested interests all trying to gain traction, and corporations are working hard with nation states to facilitate their continuous profiteering, by developing data surveillance to a level where privacy will be utterly meaningless.
I enjoyed the film for what it was.... grains of truth woven into a relatable narrative basically.
As to the future - well, after the last three tears, very little would surprise me... not even bloody aliens at this point....