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?
I think this is the closet to reality.
Very few people spends bitcoin outside of the BTC world TODAY.
I have yet to replace any FIAT transaction with BTC.