Now, Bitcoin is processing 4.6 transactions/second [1]. VISA alone is processing 1700 transactions/second on average, with peak transaction rates claimed in the 24000/second [2]. Mastercard is similar, as are other payment processors.
Even worse, the claimed energy usage is for the entire banking system. This easily amounts to billions of daily transactions, but also many other services that Bitcoin doesn't even come close to offering: insurance, mortgages, credits, risk evaluations, escrow and many others. All this for a mere 2x the total energy expenditure.
[0] https://cointelegraph.com/news/banking-system-consumes-two-t...
[1] https://towardsdatascience.com/the-blockchain-scalability-pr...
[2] https://news.bitcoin.com/no-visa-doesnt-handle-24000-tps-and...
Bitcoin costs $150-$300 per transaction. Unless I'm misunderstanding something?
Needless to say, nothing in the regular banking system comes anywhere near those kinds of costs.