I'll contend that Mt.Gox::Bitcoin as Napster::MP3. MP3 was "good enough" to revolutionize the way we buy and pirate music. Napster was enabled by MP3 tech, but

I'll contend that Mt.Gox::Bitcoin as Napster::MP3. MP3 was "good enough" to revolutionize the way we buy and pirate music. Napster was enabled by MP3 tech, but flamed out spectacularly. MP3 survived though, and now more music is sold online than in record stores.