To get away from the ever inflating fiat. But since we cannot spend bitcoin directly everywhere yet, it now serves as a good investment. It will have a high value in the future so having them now while the price is still at low is very profitable for us.
Use of digital currency or bitcoin doesn't work as a solution for the inflating fiat usage. Digital access is much related to technology which won't interest more people. Certain number of people starts using it. Remaining continues with fiat as it cannot require any technology advancing knowledge.