When bitcoin price hits 10,000$, Perhaps we will not use traditional currency (cash).
Untill that time, we will be using smart devices to pay everything with bitcoin.
yes i can also hope so, but still it do not look like so, because bitcoin is not yet used by all the people of the world and most of the people of the world still depend on fiat and those people who are using bitcoin they also use it as secondary option and the as primary.
It is still very far if we are going to look on what is happening in this world. But still bitcoin is making unexpected things so we don't know whether it will be reach to $10,000 or not but making the fiat worthless is really very far on my sight that is possible to happen. Because no matter how much is the value of bitcoin , fiat will still be needed.