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It removes the need for trust in financial management
It allows an easy mechanism for machine-to-machine payments
It's not yet widely accepted in physical locations
There are potential scalability concerns (especially given current developer politics)
It's at least as uncensorable as physical currency, with most of, if not all of, the privacy
If it becomes the reserve currency, it removes the possibility for governmental monetary policy
Transaction fees are (in the foreseeable future) are significantly cheaper than on the current infrastructure. This could mean that, if widely adopted, it would remove a significant drag on the economy.
It is bureaucracy free.