My DD is 15.5 months old, and she still nurses at least twice during the night. She is not reverse-cycling; I am a SAHM and am with her 24 hours a day. She eats 3 meals of solids each day, with snacks in between. Sometimes the snack is nursing, sometimes it's fruit.
In my opinion, she needs to nurse at night. Either she is thirsty or hungry or just needs help getting back to sleep during a brief wake-up. It doesn't bother me too much; I just get closer so she can latch on, and I go back to sleep. Of course, I wouldn't mind if she started sleeping straight through the night, but I don't feel I have much "choice" in the matter. Why would I sit up and rock her or try some other method of getting her back to sleep? That would require that I wake up and lose out on sleep. By nursing her, I can go right back to sleep.