It does make sense if you accept two hypotheses:

1/ cryptocurrencies are here to stay, like it or not

2/ The environmental harm done by PoW is a much greater risk to oneself than losing some money on staking.

Then staking becomes a « vote with your wallet » situation to nudge the entire cryptocurrency ecosystem towards non-polluting algorithms.

If you prove switching to PoS can be done at Ethereum’s scale, the case to ban PoW altogether becomes much stronger.