In my opinion, the probability of bitcoin to be worth 0 is only 0.001%. The reason is, the cryptocurrency community is growing so that bitcoin still has a level of trust and that makes it valuable. If 10% of bitcoin holders don't believe it, then they will sell it so that the market becomes bearish, and it will be used by 90% of people to buy it. So, it is impossible if bitcoin will be worth 0 because many still believe it and the bitcoin community is growing.