Eh, that enormous energy consumption hasn't change, y'know. For Bitcoin, for example, the basic concept is still that ALL wallets have to process ALL transactions, which scales as well as studfing a walrus in a mini Cooper. Bitcoin is extremely energy inefficient and is simply not a good replacement for transactions for the entire world.

Same goes for all other block chain technologies, they're fundamentally flawed and won't ever be good. If you want a good alternative to visa and MasterCard, you'll need something fundamentally different from blockchain tech.