Bitcoin and most other cryptocurrency is almost exclusively used for speculation. People generally buy bitcoin for one reason and one reason only: to get rich from selling it later.
A currency driven in this great a percentage by speculation is a dangerous bubble. Until it lives up to the hype and this blockchain ecosystem actually exists in a density large enough to realistically support the currency's valuation, I would listen to Warren Buffet's advice.
There's a lot of adherents who are reaching fanatical levels of devotion to blockchain, and those types will explain away any unbeliever's lack of faith. The fact remains--cryptocurrency is almost entirely driven by speculation. A sustainable currency doesn't do that. A Ponzi scheme does that.
A lot of the blockchain applications seem really kind of flimsy and hollow, as if they are really there to prop up a crypto fortune in the hopes that some kind of ecosystem develops and prevents the inevitable crash. Those probably aren't going to work. Once again, it points to fact that the primary purpose of the currency is currently just a get rich quick scheme.