Are you saying that traders selling their holdings is an indicator that the price will rise in 2019? Because that's not how the market works. No one knows when the prices will rise.
Probably he meant that most traders have already sold and left nothing which makes them to sell nothing more. When most people will not sell, prices may not get dumped and also, what you will do after selling and seeing prices got lowered ? Buy back ? Why not that situation may trigger the much anticipated price rise ?
What I want to say is that people shouldn't expect too much in too short period of time. By that time try not to accumulate loss that is not necessary.
Continuing my bitcoin holding is the thing, I am just following because no one could predict the bottom has hit or yet to hit. But, keep holding is just way of supporting bitcoin also I am not having any near time commitments for my bitcoins hence keep holding regardless of how much potential losses I am incurring are least bothered. I just keep holding not for 2019 end but for 2030.