There are lots of prediction that begun with this year concerning the price of bitcoin, and they looked false, actually appeared false.
The rise in the price if bitcoin as at 2017, was due to a high number of people adoption into the crypto space, and that made the year a boom at the last month of the year. 2018 has been on a correction move from day one, and even till the end, and people saying according to forecast of previous years, bitcoin getting back to $20k will be 2021, I do not agree.
I mean No offence, as the day goes bye, more people are coming into the crypto space, and the current adoption of bitcoin in the world is far greater than that of 2010 -2015. 2019 is another big year, that more people will join the community, and the demand will rise (except bitcoin/crypto currencies does not abide with the law of demand and supply).