I know the question is annoying but it does reveal the trepidation that many people will have. It's understandable why they feel that way.  People in general have an understanding of their country's fiat currency. They probably know it can go through inflation or deflation. But they don't expect to wake up tomorrow to see their fiat currency go to zero. With these digital assets that they don't understand, it's understandable why they think Bitcoin can disappear tomorrow.

Expanding these markets will take time and education. Don't expect newbies to not be concerned.