The value of these things is a Keynesian beauty contest. If enough people decide that Bitcoin is a valid currency then it is a valid currency (just like baseball cards).

I think that would be bad for society. Any new value in the bitcoin ecosystem increases the value held by the early adopters - who are mostly drug dealers or other criminals, and the rest are the miners who enabled them. (bitcoin does have some advantages for some legitimate use cases, but the biggest advantages were for the criminal use cases).