Well everyone has it's way of using things. If they only use it for that there's nothing that we can do about it.
I am happy that more people are using the Bitcoin, even if it is only solely for investing.
And it can also be said that if a person start to use Bitcoin for a particular purpose then he will also use it for his needs like to use Bitcoin to buy different things from online shop and to use Bitcoin for transacting the money to any other person. As if he will start using Bitcoin then he will know about a number of other features of bitcoin and so he will adopted it as a full-fledged currency for himself.