Well, no electricity, and no internet connection would kill BTC for sure! You wouldn't be able to make any transactions without these.
Other issue can be all the countries in the world ban BTC, but this will not restrict it's circulation, as no internet connection do!
Definitely, and if i may add END OF THE WORLD?. (Smiling) bringing bitcoin to a total shutdown is like waiting for the ocean to dry, possible but it'll take time and it'll happen in differrent places first, different scenarios and different reasons.