At least, there are some millionaires putting their money and faith into Bitcoin. Elon Musk and Mark Cuban have joined the crypto/Blockchain craze. Not everyone will find Bitcoin as an attractive investment, because of its widely unpredictable nature. The constant fluctuations in price, makes people think twice before relying on Bitcoin as a long term investment. What matters is that Bitcoin stays decentralized and censorship-resistant. As long as there are loyal supporters behind the project, there should be nothing to worry about. Just my thoughts 
Elon Musk is a grifter that help to create Paypal, the biggest fraud in payment processing companies out there - his input to crypto is not needed. The worship of Musk because he brought the price of BTC and doge up is getting out of hand - he runs a tech company, he isn't a crypto guru nor should he be treated like one.