It is not easy to know what will happen in 2019 especially when this year has been so bad, there is a very real possibility that the next year is not going to be that much different and that is going to scare a lot people away from this market regardless of any advancement in technology of cryptocurrencies, this can be good or bad depending on your perspective, it can be good if you have money to buy cryptocurrencies but if you don't then it is going to be a difficult year.
It's panning out a lot like 2014. Not the exact same shape, but similar slow and prolonged decline. It wouldn't surprise me at all to see a capitulation like January 2015 followed by a year of sideways where everyone forgets about Bitcoin.
I think 2019 will be a quiet year, and 2020 is when the market will start getting hyped again.