[TheCoelacanth]

It seems to me like bitcoin is more comparable to a wire transfer than to the other forms . Like a wire transfer, but unlike nearly every other form of digital payment (credit card, debit card, ACH), it is irrevocable. It's fees are also competitive with the $20+ that sending a wire transfer will cost.

That would make it something of a niche form of payment compared to say credit cards. You aren't going to use it to pay for a cup of coffee, but there still are trillions of dollars worth of wire transfers per day. That is roughly one thousand times the amount currently transacted per day in bitcoin at the current valuation so even taking over a tiny portion of the wire transfer market would justify bitcoin's current valuation.