There are many purposes which can serve by kitchen island. Not only ad a dining table, but it also can be used ad many other purpose. For example, you can make a rack to stack a book or a bottle under it. Other than that, you can also use it as a seating area by change it as sofa.
Find other way to make storage to put some cooking utensils. You can add it with baskets or drawer. Some people also use it as a living room to make it more comfy. These choices will add up some functions to your kitchen island.