[wmf]

That's not good enough. Even a $10T market cap doesn't justify 6 GW of power consumption when PoS would consume effectively zero.

[kinghajj]

PoW uses energy consumption for security. PoS uses staking for security. Every analysis I've seen agrees that PoW is more secure than PoS, precisely because of the energy requirements. Those who favor PoS argue that it's still secure "enough"; those who favor PoW disagree and prefer the increased security it brings.

[nfin]

Here something to read for those really interested in knowing both sides of the argument (PoW side in this case, as the potential benefits of PoS are clear to everyone):

https://medium.com/coinmonks/blockchain-myth-5-proof-of-work...

https://www.truthcoin.info/blog/pow-cheapest/

https://medium.com/coinmonks/proof-of-work-vs-proof-of-stake...

That's a bit to read, but not a topic that one should just think he knows about (and these articles have quite a lot of overlap)