1 Bitcoin is worth whatever you can buy from it at the present moment. The more the US dollar becomes obsolete the more Bitcoin will stablize to whatever value it truly is. Which is way more than it is now since there are only 20 million of them circulating. Think about it, if FIAT was obsolete and there are 20 million Bitcoin to 8 billion people, the value would skyrocket from what it is now. Instead of being able to buy a Tesla with 1 Bitcoin you would be able to start a Tesla dealership.

