For real! No one is really sure. The death of any currency is dependent on the users, its general acceptance, and the demand for usage. If everyone decides to want to shift to probably ethereal today, well apparently, ethereum steps up! However, I am not sure such scenario may happen. But come to think of it, looking at the effect bitcoin has with dragging all cryptos with it whenever a huge downtrend or negative mews occur for bitcoin, sometimes it makes it hard to know what Could happen if bitcoin dies. Well, with all that being said, I totally believe bitcoin is here to stay.