Bitcoin isn't even the biggest winner. 2017 is when other cryptos took over gain-vise (sector rotation), and new money discovered that although the Bitcoin train might have left the building but other cryptos still can make sizeable returns. LTC went up 200% in the last 5 days, BTC is up only less than 10%.
So as 2017 was the year of LTC and ETH taking over profitwise, 2018 will be the year of big crypto crashes when even the new money realizes that this kind of returns can not be up and there is such a thing as too much of a good thing...Having bitcoin futures is just a sign of the top and also will make BTC less volatile in the long run, helping other cryptos to gain acceptance/rise.
I'm no expert but anyone who is long and not on margin won't care about volitivity as long as the moving average is positive.