A place without wifi or power couldn't use bitcoin.
And I guess it don't matter since they can't use Bitcoin in that place.
Most likely, bitcoin will die if the Internet dies. But now the whole world is focused on the Internet, so even if something happens to him, it will not last long.
Happen to "him"? Who's him? Internet is the blood of Bitcoin, without it will obviously die but internet will not die that easily since it is a used scenario that we always use the internet every time in our life.
Bitcoin can shutdown once no one invest on it and no electricity or no internet the are main for shutting down the bitcoin its really important that all of this are not shutting down to always remain bitcoin.
If no one invest on it I will kill myself. Electricity? Nah, that is way out of the box.