Why do the number of addresses fall every now and then? I would assume the graph should have gone up all the time, no? When people lose interest in bitcoin, I would have thought that they would just uninstall their wallet apps or something. Are they deactivating their addresses as well?
Yes you're right because the only thing that makes the bitcoin fall and become worthless therefore the bitcoin would no longer run. So people is the great factor why bitcoin runs even in its high and low price. Bitcoin price fall not because it will no longer usable but it is because bitcoin price is really unstable.