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"