i would keep it if you do play the instrument, because--in time--you will likely play it again. your DS will also play it.
i will also add this. if you let go of the TV (assuming you haven't already), you could add a family music time, singing with piano accompanying. this could be a part of your household on a daily basis.
in our home, we are looking to do this once we get settled in our business properly. right now, it is a bit of work, so we are unable to do this. DH plays trumpet, i sing, and DS loves drums and harmonica and ukulele and piano and wahtever other instrument happens to be around.
in time, our plan is to have music times with the whole family, and individual practice times as desired. right now, it's pretty hap hazard, with DS playing as he wants, and we join him. none of us play ukulele or harmonica, but we are getting there. LOL drums are easiest for all of us.
though we don't play that well either. LOL