We're talking about the long-term viability of something, so it makes sense to talk about how that something will look in the very near future.
The completion of Ethereum's transition to Proof of Stake will occur very soon, most likely within the year. The testnet for the merge - which is the term describing the technical process that completes the transition (it refers to the currently running Proof of Stake Beacon Chain being merged into the execution chain to allow Proof of Work to be turned off) - is already running:
Why do Ethereum fans keep using this example as if it’s already done, when it still isn’t?