I think that this might not be the time for altcoins to rock the market. It hasn't really been a good year for a lot of them, and we are hoping to see them do better in a better market condition, and that I do not see happening anytime soon, so let's wait and see how next year would go.
Now I do not expect to see any rapid changes in the growth of altcoins price as it depend on the price of bitcoin. Rather this year will be more calm. Hope in January 2019 something will change!