Hmm, did you read that news carefully?
he dumped the cryptocurrency because he did not want to worry about its erratic price movements.
So this doesn't means that party is over and he sold all bitcoins because it has no chance to rise. This man clearly says that he wants quiet life and don't wants to worry everyday because of bitcoin's price and I truly believe what he said. Bitcoin really caused insomnia for me but now I am no longer worring about it, can sleep well.
No one knows actually what will happen around bitcoin's price....