If Hunger Games were written by JK Rowling, the end of Mockingjay would be Katniss and Peeta cheerfully living their life, not affected by anything that happened. It would all be over! (Full disclosure, I prefer the ending of Mockingjay to the ending of Potter by a long shot. Actually when I read Mockingjay, my first reaction was "WHY DIDN'T POTTER END THIS WAY?!")