Personally, I never found the energy arguments against crypfocurrency to be particularly compelling. I figured eventually transaction fees would have to pay for all energy consumption due to the transaction, or mining wouldn't be profitable. It's still too soon to tell, but I think we're starting to see that with this latest Bitcoin halving, but it's hard to tell because it seems like transaction fees are driven a lot more by demand than by miners. The total hashrate seems to be dropping, though.