what proportion of bitcoin is actually spent? i'm gonna guess that it's not very much. using it for shopping and all is cool but i think it's a little bit of a sideshow. most of the action is trading it and speculating.
the bigger question is if no one speculates on bitcoin what might happen?
Same thing: the Bitcoin collapse would take place. Just like Gold, Silver and all the others: magnates are taking care of them, so they will rise or fall whenever they want to.