I don't think it's at all clear that Bitcoin adoption will go up. It's never been useful as a currency for most people, and Tesla aside, merchant adoption has been in retreat for years. KYC/AML laws are reducing its utility for financial crime. Its only real advantage is in speculation and market manipulation. But both of those depend on volatility.
Large cap stocks weren't engineered for stability, but they're lower tail-risk than mid cap stocks, which are lower tail-risk than small cap stocks, and so on.
The same phenomenon has been broadly true across all markets over all of human history, and the underlying mechanism (heterogeneous flows) is well understood and rather intuitive.
Whether or not BTC adoption increases is not relevant to what I was saying. My only claim is that volatility will decrease if adoption increases, counter to the misplaced scepticism of the post I was replying to
If BTC adoption decreases instead, then volatility should increase, ceteris paribus.
The mechanism is that you get flows hitting both sides simultaneously (56 buyers vs 44 sellers) that tend to cancel out, instead of a single player (3 buyers vs 1 seller or vice versa) dominating the flow.
BTC volatility will go down as adoption goes up.