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.
indeed for bitcoin to reach such a number it will be difficult because there are still many bitcoin users and with the passage of the era in gilat there will definitely be a popular increase that will make bitcoin valuable