Every gamer (PC or console) that has used the "look at how much energy is being wasted" argument to be anti-crypto will have to eat their GPUs after the merge.
Bitcoin will be still wasting a crap load of energy, proportional to its value and has no plans to stop doing that.
You can be pro-crypto without being in favor of Bitcoin, you know? In fact, those who oppose crypto due to environmental concerns would help immensely if they stopped generalizing and became more specific about their arguments.
Bitcoin was a good first prototype, but it is clearly a failed experiment. It's not used as a currency, the "store of value" narrative is bogus. All it took was the first asset bubble to pop to demonstrate how BTC is only correlated with other stock prices.
It already loses to Ethereum in many metrics: transaction volume, number of wallets, decentralization (number of nodes participating in block validation) and so on. Layer-2 systems in Ethereum hold more Wrapped Bitcoin than lightning by orders of magnitude. Even if you really want to use BTC, the best way to transact bitcoin today is by wrapping it and using it on Ethereum.
IOW, stop criticizing "crypto" and start focusing on criticizing "Bitcoin". Be specific about your arguments, otherwise everyone will feel like they are on a Mexican standoff and you will never get the support to win the good fight.
The unethical thing is to keep BTC around just because there are so many sunk costs associated with it.
Look at Coingecko's list of ERC20 tokens, all of the top 60 tokens have a market cap above $1 billion. You can go ahead and remove Tether if you want, there is still another ~$100B there.
Bitcoin is not so dominant as the maxis would like to believe. It won't take much for Ethereum (as an ecosystem) to catch up, and when it does the flippening will come fast.