There's now Ethereum, Base and Solana featuring US dollar stablecoins and significantly cheaper fees. If you want to go a step further and eliminate the stablecoin issuer's counterparty risk you could even pay in the base asset of ETH. Shopify allows payments from crypto now, so Steam should try it again.
Good luck censoring purchases on ETH.
There are plenty of alternatives to Bitcoin payments in the crypto space.
The problem isn't technical, the problem is getting people to care.
Even stablecoins aren't so great for the environment. Proof of stake isn't as bad, but also doesn't offer much beyond traditional systems once KYC is needed.
Am I missing something?