Legitimizing Bitcoin more than offsets the environmental benefits of electric vehicles.
Hes legitimizing crypto in general. PoS will be proven to be more efficient in almost every way, people will gravitate towards that. Bitcoin has the network effects of being the first mover right now. Ethereum is surpassing it on many metrics, txs/day, $ volume processed per day, etc [1]. [1] https://www.blockchaincenter.net/flippening/
We've already known PoS is more efficient for like a decade haven't we? When will it become real and actually start to supplant Bitcoin, 2030? It's a very interesting theoretical point but I don't see how it's relevant when we're talking about the environmental impact Bitcoin has been having for years while Tesla is dumping money into it.