I agree, it totally depends on your family and if you enjoy eating that late.
But, I do have a big concern about it being your last night. Personally, I would change it to another night and to a earlier time. I prefer the 7 show as you have the whole day for the parks and it is still early enough to eat and get back to your hotel at a reasonable hour. If you are going to the late show, consider that you will be getting back to your room extremely late. If you haven't packed yet, it will be even much later till you hit the sack. If you can change it, I would.