Its a high for bitcoin ,as electricity is the ultimate need of hour many organisations are making it from natural resources like solar ,wind etc the electricity is going to be cheap and more over electrical devices coming in future will be more efficient
Maybe no, electricity could not be the only reason for Bitcoin to collapse. There so many factors that can lead to BTC's end, for example the internet. Humans keep pushing forward and keep on inventing new things. If bitcoin was created out of theories and scientific inventions, then we can also assume that their could be an alternative on creating new energy source.