... the entire purpose of a currency is to become a monopoly, a consensus mechanism for exchange. The less of a monopoly it has, the less useful it is. ...
Bitcoin: ~99.9999999% short of monopoly.
Calculated (theoretical) Usefulness: Useless.
Actual Usefulness: Scientists working with CERNs Large Hadron Collider, a 17-mile subterranean loop that smashes particles at nearly the speed of light, are yet to confirm a single instance of "Bitcoin Usefulness Event."