I think there's no proof that Bitcoin has zero value, how can be a great coin become have no value if many people are still want to buy this coin
If no one wants to
buy use it as a medium of exchange anymore, then it has zero worth. The chances are probably small in the short term. However, can we really determine that in 100 years, people are going to still find Bitcoin has worth?
if we think negatively about bitcoin then zero value is the truth that might occur but seeing the progress of blockchain and cryptocurrency technologies that continue to be developed and used to be used for micro and macro industrial economics I am sure zero values will not occur