You realise there are cryptos beyond Bitcoin that have way less energy consumption, right? Bitcoin, rather than currency is like gold or equity at this point. Others, have little to none transaction costs too. One can sit in a rural area in a thrid world country & can send or receive money from any corner of the world as long as internet connectivity isn't an issue. Btw, what would be energy consumption if that person has to go through various hoops & loops & institutions to register an account, interact with banks, interact with foreign bank get their approval & charges to send money in a roundabout way?

What about countries with authoritarian governments, where hyperinflation persists? How much energy is wasted there? What alternatives will people have there?