short answer no, just a little crisis due to the price being low/many lost huge amount of money because they bought at the peak, taxes being a problem, and other small stuff
just a despair phase that is very long apparently
Yes it is a big no, the bitcoin will not just simply vanished, it jas billions of users all around the world. Maybe the value of it lately was a little bit lower than usual and it kinda falls, it is just because of the segwit happening. But now that it was successful, look at the value of bitcoins now. It came tremendously high. Lucky for us we didn't panick selling.