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!
Big yes for that the only big problem of bitcoin is if you dont have a enternet connection then you cannot do a transaction via offline method i hope someday developers can find a ways to change this fact