Technically, its possible that 0 price can be attained. However, I don't think that we are going to see that price because of law of supply and demand. Bitcoin because so limited has its perked. The price can grow overtime because more and more people are going to demand, but with less supply the price could literally skyrocketed as the supply is getting smaller.
Thats only a speculation, but it doesn't mean that the price of bitcoin is going to zero, same as the other cryptocurrency, because we have a lot of user and a lot of investors. If many investor will invest in bitcoin no one could say that bitcoin price is going to zero. It might be decreasing its value but if you keep on believing that bitcoin will bot be going to 0, you should keep on thinking positively about the price of bitcoin and recover again.
Yes, bitcoin and other crypto has gained the trust and confidence of the community, which means that it has hard core fan based, who are going to buy it because they speculate that it will grow overtime. So I really don't think that bitcoin will go to 0.