Bitcoin seems more like a speculative commodity than a currency. As long as Bitcoin is experiencing such instability, how can it be useful as a currency?
yeah, it's definitely a commodity. but same can be said about other speculative commodities such as gold or silver, and they've been used as currencies (ok, not quite, but close enough) for thousands of years :) not to mention that instability in actual currencies happens all the time, if you look outside of the post-ww2 first world.
It's been stable for a long time before this jump, and over much of its history. Yeah it is disruptive!
It's very easy to use as a currency since it's the only way you can send value instantly around the globe with almost no cost and without any regulatory issues.
