Unless the entire power grid of the world would shut down after a huge EMP hit would destroy all electronics in the world...
That would affect the entire world economy. In other words, to get rid of Bitcoin entirely, you have to get rid of everything else that accounts for a much greater value than Bitcoin is. That's a very bad deal.
On the other hand, if we all generate our own electricity we can still use Bitcoin through satellites. I'm not sure how safe that would be, but at least there is still an option to transact with the outside world. Power to the people.
P.s I think I watch too much sci-fi movies :'D
That's actually a good thing. Sci-fi movies in some cases are an indication of what we can expect in the future. It's also a reflection of the free mind, something our governments try to talk out of our head by indoctrinating the younger generation.