My friend decided to sell his car and invest all the money in Bitcoin as some people predict that 1 BTC will reach 500 000$ till the end of 2019.
He totally believes in it and tells that then he could buy not only a new car but a flat also.
Does it really worth it? He uses his car for his work and now he wouldn't be able to do this anymore as he thinks there's no need to work anymore.
I don't think its a good idea, I presume your friend invested everything to bitcoin? if yes then he messed up for real, price speculation is not an assurance. Everybody could speculate the price of btc but always remember this market is risky and everything could turn out really bad.
Can invest in bitcoin a smaller amount and increase the number of your bitcoins by selling them on the exchange for a large price and again purchasing it later on the bottom. 500K will not be tomorrow and not after a year. There is a lot of time for trading.