I don't think it's right to think crypto will be stable. because even if mass adoption has been achieved price stability will never exist. crypto is a decentralized platform and no one can have complete control over the market. so there is no person or institution that will stabilize the price if at any time there is a dump or pump. so stability in the crypto market only applies to stablecoins. for a fully decentralized coin like bitcoin, it can't really be stable.