I think it will be still used by people because bitcoin is not only an investment but also as a crypto currency. Infact the idea with which bitcoin was introduced in market was cryptocurreny nit an asset.  And it get popular because of its benefits it offer its users nit because it's fluctuates price value.  Bitcoin value increase with time it is a bonus.  But we can not forget that bitcoin is first a crypto currency, it get famous because It gives so much benefits. Bitcoin has several advantages.