To mine 1 Bitcoin with waste majority of worlds cost of electricity is way under $5000k. In Venezuela that have cheapest electricity is way way way under that number.
If we forget everything else and take just cost of mining to get price of Bitcoin, then price for Bitcoin can go to $1 or less. It goes like this. At this point in South Korea where eclectic s most expensive is not worth to mine Bitcoin so all miners from South Korea stop their miners. That reduces overall hash power and difficulty decrease and all the rest miners gets more bitcoins for their hash power they contribute. When more and more miners stop mine difficulty keep falling and that makes mining easier for the rest of miners and then their cost to mine 1 BTC can go to $1.
But price of Bitcoin is far from being dependent only of this