Personally I hope crypto succeeds in the long term, but using environmentally-sound methods.
ETH's move to Proof of Stake is a promising candidate, and outside of misuse/abuse of the blockchain for pointless shit like "NFT art" it showed the world that decentralised finance could actually work. Sure, it's not perfect and there have been some high-profile issues with it. But guess what, global banking isn't perfect either, it's rife with corruption, fraud, theft, compute errors, laundering, organised crime syndication, and often at the mercy of corrupt governments or at least corrupt government officials. At least DeFi can potentially defeat some of those problems.
I'm hanging onto 10 of the ETH I mined, having raked in a healthy profit during 2020 and 2021. Maybe it'll become worthless, maybe each ETH will be worth enough that I can retire early. I'm prepared to lose it and don't need the money at its current worth.