As the staking fees come in to development on mainnet. Ethereum will be more stable and the staking fees will continue to increase paying compound interest making ether more stable in the future.
how it works will not be that easy, all depends on the market, where demand should be followed by sales, if stability can be achieved then ethereum will not experience big changes. price agreement in the market will never be stable. whenever it can go up and whenever it can go down.