Yes it's possible for bitcoin to become worthless, if someday the bitcoin price dropped to under $10, i'm sure people will stop using bitcoin anymore.
Are you sure about that? bitcoin still has value if it ever goes down to $10.
And you know what? people will not stop using it because the demand will rise and its going to be an opportunity for everyone to avail cheaper bitcoins.
That's why i said "IF" dude, of course i don't want the bitcoin price hit $10 per bitcoins but no one knows, anything can happen in crypto world. Even if bitcoin price hit $10, it will not happen on the next 1-5 years, maybe in 10-20 years. "IF"
I think it's very impossible for a bitcoin to have a price value of 10$ unless something there's a replacement. Even the price value of bitcoin is 10$, most of the people will invest a lot on it but I don't think they will have a bigger profit because it will only happen when the era of bitcoin will come to an end. Basically, it will be non-sense if they buy a lot of bitcoin when it becomes cheaper, I know there's something huge that will come and replace it.