https://www.bloomberg.com/news/articles/2018-11-02/s-p-500-s-wild-ride-makes-u-s-stocks-more-volatile-than-bitcoin
Methinks that the increase in bitcoin adoption has done its work in reducing volatility.
On the other hand, it might be due to the reduction in adoption that have made the price of bitcoin be less volatile at this time. Because at the time when the price of bitcoin as touching $15,000 the massive publicity that greeted that was overwhelming both the positive ones and the negative ones which led to more people buying and more increase in the price of bitcoin but when the tides changes, coming with bans or regulated advertisement from various social media platforms, government cracking down on crypto currencies, top influencers in the world of finance ranging from CEOs, to entrepreneurs and legends making some statements on the contrary, the adoption movement began to suffer some serious setbacks which is what the market is yet to recover from.