The prevalent theory is that once mass adoption is achieved and there's like a lot of money into bitcoin, market cap goes to the moon, liquidity will be very high, several financial mechanism will be available to stabilize the price and by then no more volatility.
I am not sure what to expect from the future of Bitcoin because allot can happen in the mean time. The Bitcoin can go really good and be worth allot of money.
It can also go down and end up really bad which is going to result in all the Bitcoin users leaving.