there is some other subjects on the same topic, nobody can say regarding this expectation or let put this way each expectation reflect each commenters, this would not hold a light.
I believe that bitcoin will really exist for a long time. Because it is really the great ways to solve the number one problem of human which is money. So then in order for us to get a huge amount of profit we really wanted to ingage in bitcoin. We are all maybe in need of money because we have obligation to provide such us food, clothing, personal matter, etc . Maybe the bitcoin is the answer for all of our daily needs. It is proven and tested that is why bitcoin is really getting more popular each day.
If bitcoin solves only this purpose i.e it is primarily used as an investment medium , then it will not be able to survive for long. I am saying this because companies like Microsoft and Apple were able to survive for so long even in tough times because they had real products and services that a lot of people were using. As long those services are in demand, these companies will keep running and they focused on things (computers and smartphones) which are used by almost everyone worldwide. Bitcoins should also have some real use like this so that people keep using it even if there is another better investment option.