The problem is that it will never be tied to anything of real value, the perception of its value is entirely circular, like a perpetual-motion machine. That simply isn't a model for long-term durability.
No matter how speculative a stock is, its value is propped up by the belief that the company will eventually be worth something. It's not just a shiny piece of paper. Crypto can never be anything but a shiny piece of paper. Lose faith in the paper, and there's no backstop.
The best-case scenario for bitcoin is that it becomes widely established and settles at a fairly stable price point, the way a precious metal does. Then I could see people owning bitcoin the way they do gold, as a stabilizing influence among all of their assets and the proverbial "hedge against inflation." Even then, though, the focus will be on how the price relates back to the dollar. People don't buy cars or houses or art with gold -- they sell the gold and buy the stuff with dollars, because ultimately dollars are what people want.