I don't believe in these predictions. In 2018 they were saying that we will have a new high by the end of the year. In 2019 they are saying the same thing.
I know that this prediction by Draper is more of a long term one but there are many positive predictions as there are negative. We chose to believe the positive ones because we want Bitcoin to succeed that's all. Try to be objective. 50 thousand would be a big achievement for Bitcoin even in the next 2 or 3 years.