I can see where you are going with that and what you are trying to tell me however the real question here is whether or not Bitcoin can go to 0.
No, this is not what I meant. I just said that the minimum value of Bitcoin isn't constant, because the cost to produce it constantly changes.
Now if EVERYTHING including energy became absolutely worthless in the world, then the base price of Bitcoin would become 0. But thats unrealistic, don't you think?
Again, the cost of producing Bitcoin isn't strictly connected with the value. There's a demand and a supply. Whether the energy rises to the top or falls to the bottom, the only thing that will change is the cost of producing Bitcoin. (
ceteris paribus)
Energy can't worth $0. If we assume that the price of all kind of energy sources fell by 50%, then it'd suddenly become much more profitable to mine bitcoins. That would mean more computational power willing to be used. As a result, difficulty would skyrocket.