Most likely indeed some of the thoughts in the future of ETH will be stable but not completely stable, yeah the more people know the crypto smaller the chance for profit but the rich are stronger so the stability I think will not be fully stable.
I think ethereum will never be a stable coin. or have a stable price. no one can control the price of ethereum. there are a number of stable crypto assets that may in the future be used as alternatives in virtual payments. but ethereum and etheruem markets will remain as they are now. keep moving and we always enjoy it.
Ethereum was not created to be a stable coin, and it will be never stable. Its volatility might be not as great as now, but the prices will be fluctuating as always. Nevertheless, ETH is one of the best investments.