This isn't true. You don't understand Bitcoin. Proof of work is the only way to secure a decentralized system like Bitcoin's. Proof of stake requires trust in a group of validators. An oligopoly of sorts. A proof of stake system is unfit for a decentralized store of value. Alternatives to Bitcoin enriched a central group of people. Bitcoin's distribution was "fair". There is no replicating it.

Picture bitcoin in its final state, where central banks trade in and out of Bitcoin to weaken or strengthen their respective currencies. Bitcoin is the only solution, and other cryptocurrency is fit for the task.