Store of value is the whole game, for now. 

Store or Value is a prerequisite for it to be a Medium of Exchange. 

If, over time it is used more widely as a store of value, it will become a preferred MoE eventually. 

Medium if Exchange is a prerequisite for it to be a Unit of Account. 

If, over time is is used more widely as a medium of exchange, it will become a preferred UoA eventually.