Earlier quoted context omitted.
Proof of stake is here in Ethereum 2.0 and it works great. Invest in that because this is the last hurrah for Bitcoin. The next cycle will be the “Ethereum is the new better Bitcoin” cycle. I say that as someone with almost all my net worth in Bitcoin but it has miserable transaction speed and energy usage. History has shown us that not innovating has never worked out for any company I can think of.
If all you care about is energy usage and transaction speed, the traditional finance system still wins. Unless people are actively trading bitcoin enough where the transaction cost because an issue, there's little reason to trade in their tulip bulbs for iris bulbs. A bet on a cryptocurrency is a bet that people will think it's worth more money, not an investment in the underlying technology.
Does it though? There are so many things to consider when talking about the "energy usage" of traditional money. All the vans moving money around, manufacturing, items to support PoS systems, sorting, protecting the money and so on.