I believe in Bitcoin as a peer-to-peer currency, but it failed to become that due to the poor choice of emission. The capped emission that was heavily tilted toward the first few years is responsible for the fear of missing out, wealth concentration on early adopters, and use as a speculative vehicle.
With a pure linear emission, Bitcoin would now, after 13 years, still have a yearly supply inflation of 7.7%, and remain more suitable as a means of exchange than a store of value. Its price would be way lower, and its environmental impact much less.