I don't believe that nothing will happen in 2019. Recently we can see that the price of altcoins is gradually going up and I believe it will continue like this until 2019.
It's possible that there will not happen too much of Bitcoin price in 2019. Stabilizing the price of Bitcoin for a longer period would certainly be very good for the development of new projects, so I am sure that it would help increase the prices on whole market of altcoins.