I think bitcoin is the choice for investment, it can be for long and medium term, my family and I also save bitcoin and I do not sell it, I only sell Bitcoin when the price is good and can give profit.
I think bitcoin has some significant capacity to hold the value but I doubt it will rocket to 1 mil since it does not have significant utility. The whole cryptocurrency utility is taking the position from the current financing system like stock exchange and banking. Plus, the smart contract and the similar crypto economy takes out the bloated intermediary middleman's profit like itunes, google, and facebook. Does gold have utility? No. Same as bitcoin and alike. It holds the value, primarily.
Of course, Its should keep getting higher and higher.